I assume Biss to be back next week..... How he responds is the more pertinent concern.
Back next week and selected are different things.
Gray or Bentancur play well in a win and it’s their spot to lose.
We saw last season - when everything was humming (and Ange didn't have to make reparatory subs) - that he liked to freshen up the FBs about 70mins in......... Spence would be perfect for that purpose as he's a more aggressive, front-foot presence than Gray or Davies.
Gray is definitely a front foot presence too but you are bang on about Ange wanting fresh legs at #8 and FB around 70mins. I also think there’s no chance Udogie plays the 90mins if he starts at all. Spence much more likely to get mins than Davies imo.