If Aru can’t hold his teammates wheel to move up, then I’m not quite sure what else a teammate can do for him in that situation – there’s the rest of the peleton to shelter in, on the final climb it’s every man for himself if Aru needs a teammate to support him there then he’s already stuffed. It hadn’t exactly been a testing day for the GC contenders up to that point – pretty much the only point of teammates for them on that finish was to position them before the final climb!
I think we have seen times in this tour where Landa could of happily cycled off the front and left Froome isolated but he hasn’t done it unless given team orders to
A completely different situation – we’re not talking about Valgren riding off the front (and I note it wasn’t Landa positioning Froome for this finish, Froome hasn’t ever had a problem holding Kwia’s wheel).