@themeistersinger
If I were in your shoes, I'd absolutely find something, almost anything, to drop, to acquire JWright, you being a Mostert holder. I'm of the opinion that the Mostert/JWright pairing is one of the best roster-building moves available.
...but that 'something, almost anything' wouldn't be Mason, especially if your waivers is simple drop/add, vs FAAB, where someone has to give something of value to acquire him.
Maybe, only one condition: If you are in a League Of Savvy Managers, which uses FAAB waivers, and who's managers know the value of Mason, and will spend FAAB to acquire him...there's this concept known as 'dropping a FAAB grenade', where you drop a valuable Player into the bidding pool, early in the Season, while everyone is flush with cash, hoping someone blows a massive amount of their budget to acquire him.
Sure, they get the valuable Player, but they're severely handicapped the rest of the way, for blind bidding.
Otherwise, stash that dude. He has some standalone value, but IMHO, he's one of the single biggest penny stocks (in your case, having been picked up on waivers), that could absolutely *BOOM*, with an injury to CMC.