wasnt the 7th / 8th Doctor caused in part by a gun shot, and equal parts Doctors not knowing how to operate on a Time Lord?
But to be fair, how many Doctor Who fans will even acknowledge the existence of that unmentionable TV movie with a certain time traveler?
well im not one of those.
The fact we saw 7 regenerated into 8 is more than enough for me, to say nothing of the fact that the 8th Doctor featured in The Journal of Impossible Things, The Next Doctor & Elventh Hour, means that for me there is no question that the 8th Doctor did happen, and that he was played by Paul McGann.