dive bombers tend to do well turn-fighting in WB/AH compared to what history suggests actual results wise for some reason (i suspect it mostly has to do with underestimation and/or lack of understanding by their victims) ...
In the war, how common would it be to have an SBD launched specifically for use as a fighter? In AH, it isn't that uncommon. In the war, I'd think it would be more likely to have a heavy, mission-tied SBD, at a severe disadvantage to a zero sent there to kill him. The zero is trying to kill the SBD, the SBD is trying to sink a ship. That scenario would lean heavily to the success of the zero, wouldn't it? The flightpath of the SBD would even be predictable.
Next, how many dive-bomber pilots were trained in fighter combat? And trained in how to use their dive-bombers as fighters? I honestly don'y know, but I suspect they weren't shown much in-depth training in that regard. I'd suspect they were shown some things "just in case", but were told "your first priority is the boat, let the fighters take care of the zero's..." or something along those lines.
In AH, an "experienced" stick is rarely found using a dive-bomber as a dive-bomber, at least in my experience. An experienced stick in a dive-bomber (in my experience anyway) is out for fun, using it as a fighter. Conversely, someone using the dive-bomber as a dive-bomber is often an easy kill.
Primary use alone would skew the AH vs WWII statistics for those match-ups, I believe.