Sorta. The biggest problem Calloway had last season was that he was matched up against a #1 corner, something Lance never saw. In the slot against a nickel, I think Marquez will feast.
That takes CGM out of the slot, where he has already feasted. Calloway is a big enough body to play outside. I doubt he's going to be our regular slot receiver. Whatever else happens next season, we'll see Thomas in the slot a lot.