I’ll concede the statement about the ability & depth of the players Rennie has to choose from is probably premature, but I don’t think Deans consistently had far better players.
For starters, saying that he had better players, other than the props, doesn’t work because other teams ruthlessly exploited our scrum weaknesses. Plus a of various times Deans had problems in the locks, backrow, halves, centres and outside backs. Not all at the same time, but he rarely had a strong, performing 1 - 15. He had to deal with patchy form from key players and general lack of ability to execute under pressure. If you wrote down the best 23 Deans had available then sure, they were better. I’d be surprised if they took the field regularly though.