It's not as if Iris being a strong trainer came out of nowhere given her abilities were alluded to. And let's take this into consideration, Drayden chose her to guard the DNA Link Pin after he's gone, that's something more important than any title.
And the irony of it being impossible for Iris to be champion given all the other trainers who managed it at her age, and had even less experience. I guess we can only accept natural prodigies when they're the PC...or Banjiro.
I mean, when it comes to an established character who had been alluded to as a prodigy, and the grandson of the Champion that came from nowhere? I can't believe people would prefer Alder being replaced by Alder Jr., and having higher levels is hardly justified since everything post-game is leveled up, and he only had a team of three.
I don't care what people say, but I wouldn't be surprised if a lot of people's opinions were coloured by some Anime-bias.