Except Kylo does not serve Palpatine. He literally tells Rey “I have other plans” and asks for her help in defeating him on the hangar.

For once I have to agree with TestingOutTheTest here. While I get Kylo sorta in a sense cooperates with Palpatine briefly, it’s a far cry from the master/apprentice dynamic we’re used to.

Granted that has absolutely nothing to do with the mask so I have absolutely no idea why Testing brought it up. It’s a good argument for a completely different debate.