Maybe but I don't think Gamrot would be the guy to do it. For such a stud wrestler, Gamrot's top game is fucking garbage sometimes. He can chain-wrestle like crazy, but holding guys down and stringing together offense from dominant positions? Not so much.
This is the guy who got confounded by Dan Hooker's anti-wrestling and repeatedly put on skates by him as well as Old Man RDA who was cutting back down to 155 for the first time in a while. He also had no answers for Beneil's willingness to scramble and use leg-lock entries as a way to counter his wrestling... and Dariush prior to that fight was not at all known for having an elite bottom game. If anything, Benny himself is known for being a really good top game guy, but what happened when he got on top of Charles? He got completely shut down by Oliveira's guard, couldn't pass it despite multiple attempts, and arguably got outstruck by Charles who was chilling on his back just teeing off.
I agree that Oliveira's BJJ is sometimes treated overmuch like "the floor is lava", but given each guy's historical performances against similar challenges I just don't think Gamrot would ever be able to consolidate position on top of Oliveira with any level of consistency. Charles would be threatening front headlock chokes, using leg entanglements, etc. to win scrambles, get back up, and secure moments in the bout.