I really doubt thar Benitez will start him given his preference for experience. Let’s not forget Onyango has not got any PL minutes under his belt, only FA cup minutes. I would like to see him get 20 mins off the bench first , youngsters often talk about the step up in pace and energy needed at PL level taking them by surprise . While I don’t believe he’d be out of place alongside Doucoure for 20 mins, he’s not a natural “ game changer” so you wouldn’t send him on to win a game, more to hold what you’ve already got.