What does that mean ? What are you comparing ?
If you take a naked player, then yes, something like 75% of his stats will come from gear and aa. But then he'll not be fighting naked players.
The largest gap and the game isn't between tha majority of players who have Khitai sets and are between pvp 4 and 8 and T4 T3 PvP players. It's between newbies and rest of the players.