You make a good point that Chelsea seem to make more Premier League loans than we do which must help in making the player first team ready.Interestingly the guy that has previously arranged these loans for Chelsea resigned in the last couple of days. The only loan I can think of recently was Jason to Sunderland which was hardly a roaring success.
I don't mind loans not being a success - at least we learn something about the player.
But Denayer adds to the evidence that players are more likely to get decent standard loans after a bit of first team football somewhere else. For example, I think we'd be able to find a PL loan for Roberts if he wanted one.
I just think that's easier with a few minutes here and there at City rather than a season not learning much somewhere else.