Ilya will get some playing time with Embiid and Okafor on minutes restrictions and Simmons and Noel out injured. I don't see him resigning with the Sixers. Chances are the Sixers only end up with a couple future 2nds which they already have plenty of.
Grant is a good defender and athlete who has 1M unguaranteed salary next year. He should fit in nicely with OKC. OKC is now 7M under the cap which makes it easier to make an additional acquisition this year.
He did play for them tonight. Is he essentially an older saric?
Haven't seen enough of Saric yet to judge his upside yet but so far I'd say that's a reasonable comparison.