For me and most of the people I rode with JMC was an MTB hero in the early 90's, proper MTB legend! The bikes, the riding, the style... he was just cool. I remember the first time I met him he was on his Harley and was in specialized casual clobber top to bottom, the guys were talking about a sponsorship from vidal sassoon (hair sponsorship) although I can't remember what actually happened with that.
Might be mistaken but I'm sure there were more than just one hardtail and one full sus that he had, there always used to be one of them in at NWMTB at the weekends I worked there. Remember him being in one day and we'd been building up cheap Raleigh's for the shop, he jumped on this massive 21" thing to quickly test ride it and pulled a huge manual across the carpark... so cool.
There's always the possibility there was more than one ht he used in for the Dirt shoot!
Anyway here's my signed card, hung up in the bike shed: