In a perfect formation box and a Fw190 positioned perfectly in it, theoretically noone would shoot, indeed.
But be sure, that will never happen.
1st: AI is not able to do a perfect formation - its oscillating all the time
2nd: you woulnd't recognise, where the perfect position for you was
and 3rd: you woulnd't be able to reach it, because you would already been shot then.
