Isak is a great striker, I think he would definitely be great for Arsenal, they are going to need some help up front. People always talk about how a team has this position locked or that position great, but you always need more players in positions so that you could have alternatives, and you could always plan for the future as well.
I know that it is not going to end up being all that crazy, we should just consider that Isak would be first option, and Jesus would probably play around him, and sub from the bench during the games as well. That way nobody gets too tired, it would benefit them and it would also mean that the yare going to be able to provide some good competition in all three different places that they will play.