Exactly!!!! There is no feasible reason Glob, of all people, should be getting any kind of screen time outside scenes of him in the background. Armor on the other-hand has the benefit of the ingenue role during the early 2000's, the role once filled by Kitty and Jubilee respectfully. Plus Logan needed that young female sidekick to humanize him, so there was no need, in the writing staff minds, to add a young black male on the main title.
And as someone stated earlier, Bishop was the last major character created that had any kind of impact on the X-Men. So when any new era starts, most of the cast has to be filled with the main stays, which happens to be Storm and all her white friends from the 60's, 70's and 80's.
In my opinion, one of Chris Clamemont's unintentional mistake was not creating more male POC on the team in the 80's. But he was obviously more interested in his Clamazons, with Storm having the highest priority (which was a good thing).