Why? He's had some dodgy games recently and has a poor injury record, but he is still very young, has put it in some very good performances particularly at the start of the season, and has all the attributes to become a very good CB with more experience and probably playing in a settled team (and if he can stop getting injuries). He's not perfect, but you don't get called up to the German National Squad if you are ****. He has a pretty high potential ceiling IMO. I expect he'll leave, but we should get a decent fee for him and while I won't lose sleep over him leaving, I'd be happy if he decided to stay, can't say that for a lot of our current squad.
Yeah, whilst it's very commonplace to put out how young Bazunu is, I think far less is made about ABK's age. He's only three months older!
We've been asking a crazy amount from our youngsters this season. Quite what Bazunu's potential ceiling is, I really don't know (but I do fear it might be lower than the club thought). But I agree with you that ABK has a high potential ceiling. He's years away yet from his best.