Pukki provided the assist for Sargent's goal and has scored 4 goals and made 3 assists in our last 6 games, so no, I wouldn't drop him. He did miss one very good chance and some half chances, but I haven't seen the highlights yet.
Aarons is an attacking FB who would be better suited to playing as a WB, but given that we only have two fit FBs I wouldn't drop him either.
I wasn't suggesting either were dropped immediately, but I'm starting to have serious doubts about both for different reason.
Aarons plays because we have no realistic alternative, but for me he's too defensive going forward he doesn't back himself as much as he used to and often chooses the playing back option when there are better forward options. On top of that his crossing ability is far off PL standard. Defensively he's poor, particularly in the air.
I get why Pukki plays, when he's in form and getting the service he's great, but playing him means we aren't playing Sergeant in his preferred and more importantly most effective position.
Krul has his issues mainly distribution, but I still think he trumps Gunn.
Gibbs is a great prospect, but his cake is heavily over egged.