PD: I think Yarde has taken the "dependable 11" spot that Lancaster seems to favor. Not that Yarde is just dependable, he is as good an attacking weapon as we've had in a while and is deceptively large - something that our other in-form(ish) wingers aren't.
I don't think Yarde has overtaken anyone per se, in that Mike Brown was playing there in lieu of any standout candidates.
Wade will get his chance to overtake Ashton.
It helps that he's started the season on fire. Think people were cautiously pencilling him in at the end of the summer tour, now they're inking it. But yeah, Yarde has all the skills for a Lancaster winger, and there's a gaping vacancy on the left, while Wade is short a few and fighting with Ashton. I know who I'd like to see win, but...
Going back to PD's comment - I quite liked the idea of playing Foden there, particularly when we were short of wingers making a real fist of things. But Mike Brown never looked like working (probably worked better than I thought it would!) and now we have wingers. I'd still rather play someone like Foden or Tait on the left wing ahead of Strettle though.