Perhaps.
Another one, that I don't think we ever got an answer on who did it, was 7DMT from Vekoma as-well? It wouldn't shock me in a bit.
I would think Vekoma would be the ones to do Guardians, not Mack. Could I be wrong? Perhaps, but I don't think Mack is a good choice for that type of a coaster just yet.
Yep, and that I would imagine they would want to go with someone that has been well tested for disney and has been used in multiple other parks in the company.