And I disagree. The G10, with initial advantage, does have the ability to maintain, or even gain more, advantage, 1 vs. 1. The problem is usually in the end game where the G10 has more trouble against someone who knows how to drag it slow, or very fast. The Hi-Yo/Lag turn thing is fine until the enemy starts to out-roll you and scissors you to death. Or, if he High-Yo's on you too and gets you caught at the top slow where he can out-turn you.
The G10 is a fine plane, but very difficult to fly well. Lots of G10 pilots chase kills around and are unable to finish them because they know they are vulnerable to chasing P-51's, P-47's etc into high speed dives so have to let the prey, at best, go. They also know when they meet a Co-alt Spit that they may have some troubles (as mentioned) because the Spit will slow everything down into a turning fight. Sure, the G10 can likely escape, but that's not a kill and is just wasting time or at best tieing up one enemy plane.
The G10 is fine many on many, simply use it like a slashing attacker, cutting through the pile and picking off anything that crosses your nose. Nice long high speed climbs on each side to maintain and replace any energy you lost on your attack.
-Soda
The Assassins.