The center position will be extra fillers at wide receiver most likely
Being a center in flag football is not the same as those that play the position in the NFL. You must snap the football still, but after that, they will run out and act as a receiver. Some might think a tight end could be a consideration here, but unless one appears out of nowhere with receiver speed, it's likely that more receivers could fill that position.
Perhaps someone like Diontae Johnson of the Steelers would make sense here. He is a shifty guy that is hard to bring down. He can separate on routes and find different ways of getting open. Johnson should also be able to use his elusiveness to his advantage and keep the tacklers from grabbing his flag off of his belt.
Garrett Wilson is coming off his Rookie of the Year recognition and should be able to have a tremendous NFL career. He is speedy and has become a great all-around receiver upon writing this article. Picking receivers and a center option here are almost interchangeable as you need speed options and guys that can get open.
Jaylen Waddle makes the list here as many will be shocked that Tyreek Hill is left off the list. His speed will probably slow down by the time another five seasons go by. Waddle is almost just as fast and should be in the middle of his prime by the time the Olympics happen. He would be a great option to snap the ball and break out onto the field.