First off: this is just my personal opinion-don’t take it as a betting prediction. I’m simply assessing this based on my own perspective!
The most likely outcome is a Ryan Garcia victory by knockout (KO/TKO) before the end of the fight, likely around the 6th to 9th round.
Reason: Despite the British fighter’s very aggressive style, Garcia has a massive advantage in hand speed. Benn, for all his aggression, leaves himself too open when attacking, making him a perfect target for Ryan’s signature left hook.
Ryan Garcia has some of the "fastest hands" in modern boxing; he is naturally athletic, tall, and has "long reach", which will neutralize Conor Benn’s pressure and aggression.
Yes, this is what everyone is speculating including if we ask AI who will be the winner for this fight heheheh. However, this is my own argument against King Ry, the father Henry as his trainer. How can King Ry make an assurance that what has occurred in his fight against Rolly Romero will not happen anymore?
Similar to everyone, we want King Ry to win with a knockout, however, would it be very shocking if Conor Benn will win with a split decision?
Yes, you make a good point here, and I completely agree that the Henry Garcia factor is the biggest red flag for Ryan. When his father is in his corner, Ryan tends to fall back into his "bad habits", loses his discipline, and fights purely on instinct-which is exactly how Rollie Romero caught him.
But here’s my counterargument: Conor Benn isn’t Rollie Romero. Rollie is pretty clumsy and "wooden", he certainly hits like a sledgehammer, but he fights in a rather strange, "jerky" rhythm that’s hard to read over the long haul. Benn, on the other hand, is much more predictable and formulaic in his attacks. He moves forward in a straight line, and against a guy with very high-quality, albeit amateur, training and literally lightning-fast speed, that kind of straightforward pressure is like "jumping into a chainsaw".
So, while I accept your scenario involving a judges’ decision, I still think Ryan’s left hook will find Benn’s chin by the 12th round, if not by the 9th

In short, we can discuss and run through more scenarios,I’d be happy to, but the fight itself will reveal the most interesting outcome!