Replacing Bratt for what? Another crazy laine thing? No thanks.
Grits is very good, but he has a big room for develope and grow. He is pretty offensive guy on adult level, needs to work more on the board battles, boards positioning, and ofcourse needs to be better positionally against cycling. His scoring upside is good, but he needs to be better passer. He is good passer, but I don`t think he is very good. May be good coach can fix this on NHL level. You know like Sharangovich - he is ok\good for his expirience, but he needs to make better passes. Gritsyuk looks like a better passer, but he is not on the top-3 ok level, may be top-6 ok level. Of course we need more agressive fast shoot first guys. He is some kind of Bratt(as i said before many times) with more shooting oriented game. He is good skater and driver. Some kind of Bratt 0.65 version. He needs more updates.
Talent is there, and he works pretty hard. He was better and better year after year. But you never know where his ceiling is. May be he can be on the Panarin level, but I`m not so bold to tellin that. And I would not be in a hurry to replace Bratt by him.