A 5th round pick is close to nothing.
Mayo is at best injury insurance, which is probably more than that 5th rounder will every be.
Moving an LTIR contract is meaningless.
Vegas wins, because they get the player now, rather than wait 3 or more years for the draft pick to mature, but really, this is a classic nothing trade.
Pretty smart move by Vegas, gets rid of some money so they have some flex room to go over the cap in the off-season, and for Arizona they get money so that they can stay at the floor. Mayo is a solid 7th guy and for a 5th and a money dump, which makes it not that bad of a deal, fair trade.
Big win for Yotes, pay $1 million in real cash for $7 + million of cap money on the IR to stay above salary cap minimum.
If for some reason Yotes need cap space to compete, the contract moves from IR to LTIR.
The best LTIR trade Yotes made was for A. Ladd.
The team was nice enough to allow him join the 1'000 Nhl game milestone club (which NYI would not have) before shutting him down to secure that extra 3rd Rd pick from NYI.