Tbh, Cilan and Iris's team could use the starters too. It would make them much more promote-able like Dawn and her screen-hogging penguin XD. I'm surprised how they shoved all three starters to Ash even after how popular Dawn was with Japan partially thanks to Piplup.
As for Paul vs Trip issue, if DP had Trip and BW had Paul, it wouldn't be as bad. But it went the other way round. Tbh Trip is just too similar to Paul, and the latter is a clear cut above the former in strength. Trip just fails to hit the bar that Paul set, which I admit is pretty high, but IMO Trip isn't close to the bar either. Aside from his Serperior, his team is kind of messed up. Conkelderp, Jellicent and a Vanillish and Lampent that somehow disappeared into oblivion.