Nkemdiche was probably never a realistic possibility on the Hawks board. They refuse to take anybody that doesn't have love for football oozing out their pores. Character concerns are okay, as long as they love to compete and play football deep in their heart.
Ifedli looks pretty good. Plays a little high, gives a little too much ground in pass protection. The latter can probably be fixed pretty easily. Playing so high looks to hurt him a bit in the run game, as he does more dancing than punishing. I didn't see a lot of tape of him in the run game though. Feet can be pretty heavy when he gets off his base, which looks like it can be helped by losing 10-15 lbs. Besides that, he's definitely got some raw strength and athleticism, and can really collapse a DT on a down block. His athleticism and reach really seem to help him against speed rushers. I know a bunch of people are penciling him as a guard, but I don't really see that, I just think he plays too high to move DT's.