I dont think it works like that.
It just means that if Thole Clears irrevocable waivers, then he can either be released than resigned, or sent to minors etc.
If Boston does claim Thole, they have to give him a 25 man spot for the next few days, and keep him on the 40 man in September. I doubt they care enough,
If I am Boston I want him catching Dickey for the Jays.