It would not be hard at all to open up a roster spot. I actually don't think Kornet is going anywhere, he has value as a 3rd unit center. But Mykhailuik and Banton could be painlessly waived for a better player. Stevens too but he is looking like a keeper.
I am not familiar with Robinson-Earl's game but looking into the stats and some of the reporting on him, it does sound like he would e a nice fit. He measured 6'-8" barefoot at the draft combine 2 years ago but is listed at 6'-9" on ESPN. Probably 6'-8" is more right, plenty of size for a PF these days. Only 22 and on a favorable contract. If he is as good as he looks on paper, he may be worth a protected first, but certainly if a 2nd or two could get him, looks like a good target.
We are getting kind of heavy on the bench with mid-sized players:
Stevens 6'-6"
Hauser 6'-7"
Brissett 6'-7"
Hauser 6'-7"
Walsh 6'-7"
Mykhailuik 6'-7"
If Jeremiah Robinson-Earl is a natural PF, then I see him as a better fit to balance the roster.