Small Wrestler (128 lbs) vs Powerlifter (330 lbs) in a Grappling Match

Bernardo Faria - No Gi Half Guard
NEW DVD by Bernardo Faria - No Gi Half Guard

In this match we can see a small guy, a wrestler, in a grappling match against a powerlifter who weights more than 300 lbs.

We can see that wrestler is having a huge problems with anything he tries on a huge guy. What do you think how good would some BJJ practitioner do against a someone this size? Would submissions do any difference or not at all?

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150lb BJJ purple belt vs. MASSIVE 250lb bodybuilder