He may not be able to beat a trained UFC fighter, even one in a much lighter weight class.
Disagree.
Out in the real world, if any person, even a Jon Jones, GSP, whoever, gets hit with one of those punches, he’s likely going to, at minimum, sustain a level of damage.
MMA fights occur in EXTREMELY controlled environments.
If this brute blasts you with one of those punches after you’ve told him to go fuck himself, after he took what you thought was your parking space, well, if you DON’T go down, you’re certainly seriously rocked. And very susceptible to follow-up attacks.
And at that point of vulnerability, if your attacker possesses vastly superior size, strength and aggression (at that moment), you are in a heap load of jeopardy.
All the benefit of BJJ/striking/“gas tank” training is dramatically diminished in that moment.
Your head, anatomically constructed as all other heads, just got pummeled by a high-powered projectile.
And now, at minimum dazed, confused and disoriented, the source of that blow is committed to overwhelming you with more focussed attack.
Real life escapes so many.