From what I've seen, it seems the relationship with Mark and Neil isn't as strong as others? Such as stage banter and introduction: "my good friend Nick", "my good friend Matt", and "my friend Mark Hart".
On the FTTW commentary, it was just the two of them and I didn't sense the closeness other members seem to hold. Just my 2c. We all have favorite friends.
I love Mark. "You've been a fan longer than I've been in the band", Atlanta 2010.
Mark joined Neil on his first solo tour . I thought they always seemed close .