After all these years, I've finally got it, and I'd like to add Sauron to the non-mutants mentioned.
And second Rob's "it's not exactly clear that ONLY mutants would be at that spot". They're all X-related, but not necessarily mutants.

Was Guardian supposed to be in this story?

~ Le Messor
"Ever notice that anyone going slower than you is an idiot, but going faster is a maniac?"
~ George Carlin