would it not have been better to pick the team then do the draw for the last seat
I think it"s most probable that that"s how rodders did it i.e. the list of names given to leigh/tighty didn"t include the chosen few. i.e. Stuart is a genuine random.
If not, and Stuart was pencilled in for the team, then the random pick should be repeated IMO (otherwise it would be the same as 7 picks + rodders and no random).