It's also unclear whether or not Ervin can stay in CF. And it's possible Weeks would be at least as good as a defensive CF as Ervin, if in fact he played there.
I think "poor comp" is a little aggressive.
Reds consider Ervin a CF for now. We shouldn't assume he'll play himself off the spot, at least not yet. I think it's safe to say he's a solid defender. Weeks could never play CF. Zero arm. Remember, he was a second baseman even in college. At Southern University. Just a brutal defender.
Sorry for the aggressive tone -- not meant that way.