Physicality is more than just being able to handle brute defenders smashing into them week in week out.
The question mark on Aguero is if his legs can hold up to playing regularly at the intensity needed at top level.
He has never been a player to press or looked athletic and injury problems last season.
That's what worries me. Messi and Aguero starting and not pressing their backline at all..... allowing them to run up the pitch and have space on the counter-attack. As much as we love Messi, he doesn't press all that much. He can be lazy on the defense. I don't think Depay will press like that either. Gini is a workhorse, but I feel his legs won't be the same. There is a reason why Liverpool doesn't start him anymore. Then Busquets will probably still start, and he declined years back.
The problem I have is our defense next season. We could potentially have a lazy team next season. Yeah, we may score more goals, but our defense may be even worst next season... if we have players who won't press properly. If our attack isn't flowing, I fear we won't have the defense to stop the other teams.