Kel Varnsen I really don't think it's as reductive as Arteta doesn't "like" Emile.
I think if he is being looked at for one of the 2 8s, then there are probably things, defensively speaking, Arteta wants to see from him in training and hasn't yet. If he is now considered as an 8 rather than a winger, as Arteta alluded to the other day, then it also makes more sense that he didn't see a lot of game time whilst we were trying to win a league title last season. It would have been a risk - sure, maybe one worth taking, but I get why it wasn't.
I have to say though, this stuff about "pausa"... you (not you specifically, Kel, the royal "you") can argue Emile hasn't got it if you want to, but I think he showed more ability to speed a game up in a minute of this Youtube clip than we're ever likely to see from Havertz. And he did it in the derby too.