I thought Party1 was referring to the leader of the group and what his set up is, so if the set up for the leader is.

leader xxxxx
second toon yyyyy
third toon zzzzz

Yes they will be different in the other screens with you at the top and not the same as the leader set up as above but I believe that party 1 always refers to the leader of the party so if you put party 2 then it should be yyyyyy or at least thats what I understand I could be totally wrong.

Can some one with a little bit more knowledge correct me if I am wrong.