If Perez isn't playing on the right, hes not playing at all, and would be used as a sub that can cover various positions.
We need to keep the competition fresh. Gray is performing better off the bench, but would still not trust him to be consistent over the whole 90 minutes. Going into the season the standout area that needed addressing was the wide players. They are contributing creatively, but maybe need to start getting in better scoring positions. Lets not focus too much on Perez and ignore Barnes though.
Also, Okazaki is the best defensive striker in the world