There was a “news” story, if I recall correctly, that EtH and the staff were not too happy with the preseason schedule. Don’t know exactly why. Too much travel perhaps?
The problem is that quite a lot is supposed to be achieved in preseason. Tactical work, fitness and international marketing. Possibly the timing of games and the travel involved is an issue but it’s a relatively short time to cram everything in.
I don’t think any of the players had too many minutes in pre-season. Injury is more likely if they are not match fit and then have to cope with a leap in intensity when the first competitive game comes.
I think more games but perhaps more Manchester Utd XI (as opposed to <fanfare> THE Manchester United) games, against the likes of Rochdale, Oldham etc, would have allowed more minutes to more players on a schedule that brought them towards peak condition before the Wolves game. I suppose these trips abroad have to be done and get in the way somewhat.