To me, the biggest unknown is Svi. He is the proverbial "Jacks of all Trades, Master off None."So far he has shown to be adequate to good in all phase of the game but he really is not very good to outstanding in any one area, at least I have yet to see it. His past record indicates that he is a good outside shooter but an outstanding one, if anything, he is streaky but not consistent; I will be curious to see how much he has improved. He can end up being the best player on the team or getting lost in the rotation; I am cautiously optimistic that he will be closer to the first.
Diallo is pretty raw and he will need quite a bit of "basketball" improvement before he can seriously contribute. I just don't see him starting until the second half of the season. He is athletic like Embiid but without the uncanny innate "knack" Joel has for the game.