Kornet is just a big body. We gave up Theis in the Brogdan trade, so it's not surprising that Kornet comes back, probably on a very cheap contract.
I still feel we need another big. Preferably a rim protector and rebounder. Our 3 legit bigs are Rob Williams, Horford, and Gallinari. But we all know Gallinari can't defend the paint. Kornet will be buried on the bench or brought out to absorb fouls but I don't feeel comfortably giving him more than 10 minutes a game in a garbag time, let's play out our bench kind of role.