They had to have some kind of agreement with the team to do that. There are many levels of rights agreements. Not all of them involve play by play. But clearly Audacy and WGR want to be able to make money using content from the Bills and Sabres. To do that, they need permission. The best person to get permission is the man the team has been dealing with.
Several market managers were let go during this change. Not in Buffalo. My view is they kept Wenger because of the pending situation with the Bills.