If he's there and the signing is achievable, then we should look at it. We do need additional options in pretty much all areas of the field, and there will be a time where fatigue and injuries come into play.
With regards to his attitude, maybe we could help him with that side of things. Ole seems like a very professional manager who will show him how to conduct himself in a certain way. It might actually be a great move for Grealish for that very reason. I do look at him and see qualities that could make him a great United player, but he won't just casually turn up and be the best player here like he has done at Villa; he will have to work at it.
I would pursue the move, but it's not going to make or break us for next season. We have other priority areas too, such as the defensive positions. In fact, that entire back 5 needs looking at, annoyingly the goalkeeper position, too. If we've got limited funds, we need to look at those areas first. I would like to see Grealish come, but I would be more than fecked off if we prioritised him over a quality centreback, for example.