Brock's VA is a lot different than random people who played random Gym leaders who haven't been around in 10-15 years. I also believe this was the writers way of giving the VA an role since we might not see Brock in BW2.Too much work? They brought back Brock's VA to voice Marlon of all people. They can choose which characters to bring back, and they can replace their VAs if they need to.
They called it the World tournament, just because it was adapted poorly and a shadow of what the games version was doesn't mean it wasn't adapted. Look at how different the Battle Frontier was from the games, what difference does it make?The fact that they didn't just call it the World Tournament says a lot in itself. Two can play this game.
No it wouldn't, Ash can lose to Cynthia in the finals of a Champion league.The criticial difference is that one quest would bring Ash's story to a resolution and the other wouldn't. That is why you're hell-bent on seeing the Champion League, but you're erroneously assuming that the writers have no choice but to make it happen.