Lamb had a very untimely fumble against Texas in the Big 12 championship his sophomore year after like a 50 yard catch and run, I think he also fumbled a time or two last year but you have to live with that every now and again with a guy who is difficult to bring down and always looking to break into the open field after the catch.
Worley is an interesting guy in the slot, he's quite slow so I think you're only going to use him there against TE's and big slot type WR's, but with his size/physicality I think he could do a really good job there depending on the matchups. I think he could do a commendable job against someone like Michael Thomas who wins with his size/physicality despite average speed and not being much of a deep threat.
For the smaller, shiftier slots we have Lewis.