Looks like Kevin had a great time and had an awesome experience rolling with Marcelo. I think that's the most important thing.
I've watched Marcelo during training rolls and classes for several years, and some of you have to put things in perspective. He ratchets his effort level up and down, depending on his mood, what he's working on, his opponents, etc. For me, there have been times where he has gone probably around 15-20%, letting me put him in bad positions, etc.
As a result, people that are crediting someone with not tapping or doing better than other people when rolling with Marcelo have to remember all these factors.