Regarding Marc
I loved Marc. I saw Queen Extravaganza 4 times and he was amazing in each. In fact I probably dig the QE setlists better than QAL at times. lol...No they don't do It's Late, but they have shaken things up a bit more here and there...and I WISH QE brought their most recent tour over here where they did all of A Night At The Opera! THAT was awesome. I'd LOVE to see QAL get bold and try something like that....I had held out about a 1% hope they'd do that for NOTW. But I realized pretty quickly that they'd never veer too far from the GH...
But I'd never want to see Marc with Queen for a tour or even a full gig. That would be too eerie.
As for if B&R performed with Marc. B&R was in the last few minutes of AI with QE when they premiered doing Somebody To Love just before QE's first tour started. It was also the premiere of the upbeat faster ending that B&R ended up liking so much that they copied it and used it with Adam during their first go around.
The only other times they've performed together is Roger with Marc doing Under Pressure at a festival and Marc sat in with Roger at a Freddie Birthday Party. I don't believe Brian ever played with him besides the one AI time. QE was always Roger's baby and pure speculation - Brian was a bit unnerved performing with him with the voice being so similar.
I prefer AL over Marc when performing with Queen as a whole. I wouldn't mind seeing one gig just for shits and giggles if I'm honest because it'd be nice to kind of close my eyes and kind of imagine a bit...but for the long haul that would be too much.
As for Marc's comments. He has never had anything bad to say about Adam. In fact he has had a ton of praise for Adam from what I remember. There's no jealousy or whatever. Marc is one of the most down to earth guys I've ever seen in interviews, etc. Just a nice guy. And people in QE and associated have said the exact same thing. I've never heard anyone who knew him/worked with him/met him have a bad word to say about Marc.
I'm glad he got to see the show (and meet with his buddy Tyler again!)