Guest 2XFY95 :
Sorry but i cant see how they can possibly rate a team by the 'on field players'. That would be even worse. Players would leave their onfield players low and then swap them just before game time.
Best advice has already been given, scout the team. Surely you do that? A good manager will not only scout the team but watch previous games, see who they kick to, where they throw in the line out, analyse spacing, depth etc and ajust tactics accordingly.
Gosh, seems like you're suggesting managing your rugby team, that's a lot of extra effort. I think they should just have a challenge button that is green if we are going to win and red if we are going to lose, then we would know without effort.