Interesting. I always had the impression that they were kind of close friends all along.
I think it's pretty obvious they were friends from day 1. But I also think they were so busy during DS times that there simply was no time to be friends if you know what I mean. Album after album, tour after tour, so only when the group broke up did they feel the release and that's what the original poster meant I think.
I agree with that point, they were friends from day one, but after the band disbanded, they continued being friends, just friends, no bandmates, friends.
They live quite close in the South coast of England, and MK is there, closest pub is John's one, so they see each other quite a lot when MK is there, even walking the dogs by the beach, they live so close that they are gonna see each other for sure.