I think in modern F1 Murray doesn’t fair well, he is far too slow to react to incidents and would quite frankly just be plain annoying.
I would bring back James Allen, but due to his ties at ITV it’s not going to happen. You see people complained about JA but if I recall when it come to strategies for teams and other technical aspects Brundle would ask James questions and he would get it right. And for those who say he was biased to British drivers “OF COURSE HE WAS!!”, it was his duty to be, what did Murray not get a boner when Mansell won a race? I for one would be the first to welcome him back to the comm box.
We should go all Harry Hill and tell them to have a fight, but seriously, i think choice 3 would be the best option(you have made it rather complicated with the numbers). All 3 sounded great in the commentary box in abu dhabi practice and it worked. Radio would then be left with no commentators, but oh well.
No on a serious note, Croft Davidson and Brundle was be a nice trio. I’ve said before as much as David Coulthard amuses me, I don’t see him getting excited enough to engage the audience if something major happens.