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Cleveland's roster construction has always been poor. Their front office has been mediocre since before Lebron came into the league. Other than Lebron and Kyrie, Cleveland has not selected a single All Star caliber player. Don't forget, they picked Anthony Bennett with the #1 pick before Lebron returned. How much better would Cleveland have been with Irving and either Oladipo or Otto Porter? Not playoff caliber, but not terrible.
Obviously, that means they likely don't get to draft Wiggins (who himself hasn't developed into an All Star), but they probably do have the chance to pick later in the lottery. Maybe instead of trading for Love they have Irving, Tristan Thompson, Oladipo and either Aaron Gordon or Julius Randle. Or maybe they end up with Embiid instead. Think about that group for a second.
In Miami, they had some pretty incredible rosters that were assembled on the fly because Pat Riley knows what he is doing. Obviously, no one knew about Chris Bosh's health issues, or he probably wouldn't have been in the NBA since those issues ultimately forced him out of basketball (though he hasn't officially retired). But Bosh, Wade and James, along with a host of players to surround him made for some brilliant teams.
The amazing thing about Lebron is that you don't have to construct an ideal roster around him to win. You just have to put something around him because he can cover up most roster flaws. Build a roster with no real rebounding? He can compensate. No ball handling, he runs point. No other creators on the team? Run the offense through Lebron. Weak defensively? Put Lebron on the other team's best player (especially earlier in his career). No depth? Lebron can play extended minutes. No roster flexibility? Lebron can just move from position to position.
He is no worse than average at every NBA level skill, so you have flexibility in how to build around him. The fact that Cleveland's front office hasn't been able to do that is telling - look at how poorly they drafted when Lebron was gone:
2011 - Kyrie Irving (good pick), Tristan Thompson (solid pick), Justin Harper (who?) and Milan Macvan (who?)
2012 - Dion Waiters (okay pick), Jared Cunningham (poor pick), Bernard James (typical second rounder), Jae Crowder (good pick). Cleveland traded Cunningham, James and Crowder for Tyler Zeller and Kelenna Azubuike.
2013 - Anthony Bennett (awful pick), Sergey Karasev (who?) Allen Crabbe (solid second rounder), Carrick Felix (who?)
2014 - Andrew Wiggins (solid pick), Joe Harris (okay second rounder).
Cleveland had 5 top four picks and they drafted one all star (Irving), plus two other good starters (Wiggins and Thompson), a rotation player (Waiters) and a starter for the Maine Red Claws (Bennett). They turned a bunch of second rounders and a couple later first rounders into basically nothing. That's poor management.
Look at their picks after they drafted Lebron before he signed his extension in 2007:
Jason Kapono - 31st in 2003
Luke Jackson - 10th in 2004
Shannon Brown - 25th in 2006
Daniel Gibson - 42nd in 2006
Ejike Ugboaja - 55th in 2006
That's it. That's their full draft record. Cleveland's draft record is horrible. If you want a look at a really sad list, you can see their full draft history here ↗ These ain't the Spurs ↗. These ain't even the Bucks ↗.
Cleveland nailed two picks in 15 years - Lebron and Kyrie. They did alright with Thompson, Wiggins, and Waiters. They whiffed on basically everyone else. Their best two second round picks were traded. That front office is atrocious. If they hadn't won the Lebron lottery, chances are Cleveland would have a pretty long streak of missed playoffs, because their draft history doesn't suggest they would have been able to put together winning teams by stringing together a few good drafts in a row to build a team.
Check out how the Bulls dynasty was built through the draft:
1987 - Horace Grant, 10th overall pick. They picked Olden Polynice 8th and dealt him and other picks to Seattle for some guy named Scottie Pippen. I think Chicago got the best of that deal.
1988 - Will Perdue 11th overall. Went on to be the backup center on many of those title squads.
1989 - BJ Armstrong (18th) and Stacey King (6th). Armstrong was the starting PG for the first three titles. King was a rotation player.
1990 - Toni Kukoc 29th overall. Was the 6th man on the second threepeat teams.
Chicago drafted two of the other four starters for their first set of titles, plus traded for the draft rights to their second best player during that stretch and drafted two other rotation guys and had the foresight to get a guy that would help them win three more titles.
Chicago wasn't unbeatable because of Jordan. It was because they nailed four consecutive drafts starting in 1987, plus made the Pippen trade. They acquired five of their top 7 non Jordan players as rookies, then had the foresight to trade for a veteran center (Bill Cartwright) and a secondary shooter (John Paxson).
The Bulls signed Paxson as a free agent in 1985, understanding that they could use a shooter opposite Jordan in the backcourt, and traded Charles Oakley (a guy they got in a draft day trade) for Cartwright in 1988 once they knew the rest of the roster (Paxson-Jordan-Pippen-Grant) was in place.
Chicago had a plan (surround a young Michael Jordan with defenders, rebounders and shooters). Cleveland did not. Look at the roster again. If Chicago had never drafted Jordan, they would still have been a playoff team given those acquisitions. Not a championship team, but certainly playoff caliber. Cleveland would have been hopeless.