Garcia is my favorite jiu-jitsu fighter.
The best fighters will always understand it's about position first. That's what Marcelo maintained and controlled the entire time. He didn't go for wild submission attempts that would have jeopardized his position in failing, he was patient and waited until he felt the time was right and then capitalized on it.
If Garcia hadn't been fighting anyone near his level, he'd have finished them very quickly. He is insanely good.