I'm not really advocating that they get used more than they should at their age. For example, Baxter has been introduced relatively slowly. I'd probably regard this as his true breakthrough season. In total he's now up to 42 appearances in total but at an average of 35mins per game. It probably would have been less if Kerrod hadn't been out injured.
Overall, England's challenge is that the last couple of generations of prop (particularly at tighthead) haven't amounted to much. We have very few in the 25-30 bracket and those we do have a pretty underwhelming. There are a few that were highly rated who haven't hit the heights expected of them, like Marcus Street at Exeter for example. We could really do with a few of those starting to bloom. That would prevent a 'too much too young' scenario for AOF and co.