It doesn't mean anyone is off. Hasenhuttl has stated he wants more depth. Playing Armstrong in CM does not add depth in terms of numbers as it removes him from the role he is first choice for as a 'number 10'.
Would be interesting to know why we didn't get a look at a VAR review for the first goal for possible offside or a replay of the possible penalty on Walker-Peters.
If it was a recucurance of an injury then he wouldn't be on the bench. He has only just come back and didn't have long to recover from the weekend. Hasenhuttl mentioned this in the press conference and that the gap to the West Ham game is longer so helps recovery.
No we don't. Players who would improve us are available a lot cheaper than that. Of course the scouting needs to be spot on. I'm sure we are all happy with signing Armstrong for £7m, Romeu for £5m, Bednarek for £5m, Salisu for £11m, Diallo for £12m.