Dan,
I just finished reading Gordon W. Prange's book
Miiracle at Midway for the fourth or fifth time...

On page 274 it discribes an episode where an SBD gunner (AMM 2/c Floyd Adkins ) of VS-6 engaged a
"Messerschmitt type fighter". I've also read where Wade McClusky reported being attacked by a "Messerschmitt type fighter"
I believe in Walter Lord's
Incredible Victory although I no longer have that book so I can't confirm it.
Do you have a source with the Japanese Order of battle for Midway that includes aircraft type for each CV?
I'm wondering if these guys were seeing early D4Ys that may have been involved in the battle.
Thanks.