I think a healthy Thomas opens things up for Olave and Calloway. I'm not sure about him being effective in the slot because you need a suddeness to be a slot player and Calloway seems like a one trick pony in regard to his routes as he is affective going deep and on slants. (Well a two trick pony).
I think Harty goes back to his PR/KR duties and gets 4th reciever snaps but we can't over work him on offense as his primary function is as a special team returner.