Her makeup would also get repurposed into the Trill makeup. Kamala is a Kriosian; the powers that be didn’t like the original Trill rubber forehead from “The Host” on Terry Farrell, so they switched to Famke Janssen’s look from this episode and hoped no one would call them on it.
I guess you could make the argument that it adds a bit of diversity to the alien looks for the cast. Keeping the “The Host” look would have one of the female cast members playing an alien with a wrinkly nose and the other female cast member playing an alien with a wrinkly forehead.
Lol, yeah. The heading is just used as a framing device. The "whoa" (for me, anyway) was realizing that that version of Prof X and Jean Grey had met before.