Cazorla is not a hard worker either, Navas isn't anything special, Schurrle is though, looks a really nice player.
The thing about Lallanas stamina sounds a bit of a myth, haven't looked up the stats but have read elsewhere that he played over 80 minutes in 16 out of Saints last 20 games and that he has run further than Henderson this season, would presume they have similar minutes on the pitch this season seeing as they are both ever present for their teams, if that running stat is true then that kills the stamina issue stone dead.
All 38 league games, 3100 minutes played, i.e. averaging 81.58 minutes per game.