They have a decent squad and starting 11 tbf. Some gaps but if Gabriel hits as a CB then it'll be a huge transformation for them. Arteta, we'll see how he is, but again if he actually knows what he's doing then he has a squad of players that can compete for top 4 with us and Chelsea (though likely fall short). Their attack especially is very good with excellent depth. Can have 2 lineups like:
Aubameyang Lacazette Willian
AMN Xhaka Elneny Bellerin
Tierney Gabriel Holding
Leno
Martinelli Nketiah Pepe
Saka Torreira Ceballos cedric
Kolasinac Luiz Saliba
Martinez/whoever
Obviously some weaknesses (especially center mid) and obviously each lineup isn't necessarily main/backup, but a decent crop of young players with a quality front 3 goes a long way IMO. And depth to rotate key positions.