Could I be mistaken? Certainly.
This is how my experience with it happened...
I'm flying NOE in a Mosquito enroute to an enemy field. Hangtime at my high left at about 2.0 k away. I've been killing sneaky goons all evening, so my eyes are really open for any enemy cons, high and low. I think my SA is pretty good, but I also know that the Mossie isn't exactly a goldfish bowl when it comes to visibility. Anyway, Hang and I had been giving each other check 6's back and forth thru the range voice channel.
Suddenly I hear the sound of a speeding engine closing on me... I check all around, but see nothing. Then, BLAM! My plane is in two pieces, and within a second I bail and open chute. For the next 20 seconds of silk-riding, I am looking in EVERY direction to find what it was that killed me... nothing for miles, except for Hangtime. I asked him if he saw what got me, but he said "nothing, you just exploded"
The text buffer gave me my killer's name, so I asked him where he came from... no response.
Now I concede it could very well be poor SA, but I really don't think so. I don't automatically make assumptions of cheating when I'm shot down.
Anyway, I remember the guy's name, and I'll be keeping my eyes open.