Morrison himself was speaking very highly of Moore back in August.
Christian Gray can shifted to boundary cornerback (he was most likely going to take Morrison's place next year at BCB), so this may very well be the right opportunity for Moore to play field cornerback and let him cut his teeth at that position.
Moore already started a game at FCB this year back when Gray was out with a shoulder injury, against a pretty good Louisville passing game (7 tackles), so it's not as if he's completely green.