I honest to God couldn't remember if they'd encountered each other. I didn't think they had, but i was concerned that if I had them act as if they'd never met, instantly someone would produce some damned annual from fourteen years ago that had a five page back-up where they were doing each other's nails or something. So I was vague about it. That line about "Who can keep track?" was as much a metacomment from me as anything else.
It works for me! I mean after all the xmen are a huge happy family!