Yep. Pretty sure both Marler and Smith are injured. Joe's always been public when he's withdrawn from England duty and I haven't seen anything to suggest he's no longer available if selected.

As for the Saints omissions, Ludlam is self isolating: https://www.northamptonchron.co.uk/sport/rugby-union/saints-flanker-ludlam-forced-miss-england-training-camp-fall-out-sale-situation-continues-2993003

Might be the same for Isiekwe?

This is just a training squad and it's without 6 teams (those currently in the play off spots + Sale and Worcester).

Steward, Loader and Hassell-Collins are unlucky to miss out IMO. Certainly more deserving than Crossdale and Earle.