Here's a different slant on it...
How about the pilot, the flying instructor?
Undoubtably, a weapon is only as good as the person operating it, and the training they've received.
Which in turn leads me to one conclusion...
The Tiger Moth and all its associated training aircraft must have "won" the BofB (if you can really win something in which so much was lost).
Just a thought
Cheers
Charlie
(remove philosophers coat)