Sixers can keep Jah and Holmes as a pair for next year and see how Embiid progresses.
Key with Jah is his knee and his outside shot, he's shooting great from the FT line (29 of his last 32) which is usually an indicator of good outside shooting (eye to hand coordination and the ability to repeat) but it's obvious he needs a lot of time with a shooting coach to perfect that shot (worked for Embiid). If the knee is finally healthy and he can get into shape, the raw material is there for a physical center who can score at will and play at least average defense. He's not going to live up to his #3 status, but that was a bad draft after Townes, Porzingis for example has fallen to earth with a thud this year.
Holmes keeps improving, for him it's just fundamentals of blocking out and reading the opposing offense and not overreacting. But he has the jumps to block shots and the bulk to handle all but the biggest opposing centers. His three point shot has improved and he has a nice touch around the basket. Too bad he's not the agile athlete that can play the "4", he'd be perfect as a PF. A bit undersized for center.
But Saric is the man, next year I expect him to return stronger and with a much improved 3 point shot (usually takes a year for most college and European players to adjust to the longer distance). If he starts hitting 35+% on threes, and improves his defensive fundamentals (with BB as coach, book it), I see Allstar games in his future.