Given Olise' experience level, stature, age & stamina -
and not taking away anything from him when I say that when he is on the field he is a real pleasure to watch - you could ( at the moment) almost decide long in advance which games he starts -

Example - Norwich, Southampton, Newcastle, Everton - Maybe Leeds - the other games Ayew starts & Olise comes off the bench -

Games where he isn't going to end up getting slaughtered by over physical defenders or tactically exposed by superstar opponent's going forwards.

Next year Olise will be older, stronger, more experienced & you may well find that the number of games where Olise starts increases & Ayew becomes more of a back up.

Seeing as we've been a 2nd half team of late I'd have Ayew in for the first 45 to help soften / prevent damage with Olise off the bench for the 2nd half

I’m a big Ayew fan. Not only his work rate but his quick skilful feet. Draws in 2 players when he’s on the ball creating space for others. Must be a mare to play against and draws fouls.