Not sure where all this is coming from on Isaac being a summer league megastar. He shot 13 for 37. That's flat out awful. Other than the game where he had a bunch of blocks, I didn't see a whole lot. He still can't shoot the 3 (but still keeps shooting it). His offensive game looks no more sophisticated than what we might expect from Williams.
Yeah, I watched the Orlando-Phoenix game with a glut of NBA bigs- Ayton, Bamba, Isaac & Bender and Ayton looked the best, with Isaac probably 2nd best, but he didn't do much of anything on offense. I'd be tempted to do this deal, but I'm not sold on Isaac.
He is a very poor offensive player. Last year he had 93 points per 100 possessions - in the 3d percentile for big men. He keeps taking long 2s, even though he misses a lot of them. When he attacks closeouts, he often can't finish - he picks up the ball early and takes those long strides. It looks great when he's getting by his man, but then he doesn't have the leg or core strength to finish strong and he misses a lot or gets blocked.
His defense, at least, isn't bad, but he does not have the body to bang with real bigs.
He might develop into a good player, or he might not. I wouldn't give up much for him now.