The "representations" Sluka references are not specified, and who knows if anything was actually signed, such as a contract, but it seems like if UNLV reneged, then he's got some standing to do this. It's definitely a strange new world, but the players' leverage doesn't mean much if they don't use or enforce it.
No, who knows? "Representations" could mean they promised him a good duel blocking/receiving tight end and none materialized. In that case, that's like any other player who takes a leap of faith that his team will follow through on its promise to improve (hello, Mike Trout!), but if a sum of money was promised and not delivered, then good for him.
I think we're quickly headed toward much more standardized, publicly known contracts. That's the only way to avoid this crap.