Nkiteah and Jesus are still quite reliable in addition to there are several adequate left / right wing strikers now, but I don't know the reasons behind the management for example who asked for it but currently Arsenal are still strong with a makeshift squad now.
If Arteta quest to get another good striker from Juventus become successful, they will sell Jesus out because it seems that Juventus are having much interest in buying Gabriel and it's going to be a perfect swap for Vlahovic to get a new striker or they may go for Ivan Tony as their next interest of the striker.
I think they still won't let Gabriel go even if there's a striker like Dusan in the squad.
Dusan will be given more trust if he comes to Arsenal but Gabriel will not be let go just like that because his performance is still reliable.
Gabriel's role is not only to score goals at Arsenal because even though he is a striker, he can also be a distraction from the opposing players so with 2 types of strikers where Dusan is a targetman and Gabriel who can play more of a role in his movement without the ball Arteta will have several options for changes in attack schemes so I think this can still be done.
But this also depends on Gabriel because the priority of the core players in the squad will be replaced if Dusan comes to Arsenal.