This is so much horseshit.

Can we get a real Pokémon protagonist? Maybe we could do something more with Origins?

The reason I call this significant is the size of the jump, from 8 to almost winning the whole thing.  Also, Ash has significantly changed as a character on a foundational level.  Hopefully they keep the team behind 90% of this season and permanently, no-crossed-fingers-backsies fire the BW writers.  And perhaps petition to have them exiled from the country.  

And like I said, the Orange League is a precedent for him winning these unusual leagues.  That's why I could see that happening.  It's just a question of how significant they'll make it out to be.

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It's basically the same jump as Sinnoh, as although Ash technically only made Top 4, he was proven to be the second strongest trainer there since he took down 2 of Tobias' Pokemon while everyone else got 6-0ed by Noobrai.

Orange Islands isn't cannon like Alola, so the only precedent it sets is for winning non-cannon leagues, and that's assuming the writers even take into account a 15 year old filler season. An extreme stretch to say the least, especially compared to all the reason we had to see Ash win in Kalos, where the writers rejected such logic.

xD he lost again

I don't mind that he loses tbqh

I did kinda expect the other ending of Ash losing. I too thought he had a great chance, hell, this was his best shot. Sure I was disappointed, but I'm not gonna feel like this is the end of the world nor change my perception of the XY/Z series just because of this one episode. Ash fought hard along with Alain and tbh, I don't mind Ash losing to Alain because he was a developed character and he wasn't cheap like Tobias nor incompetent like Cameron. Sure some would point out some of the illogical stuff that happened throughout the battles, but when has that never come in affect in the anime? Pikachu once defeated Geodude with one Thundershock (albeit on steroids sorta). In the end, I'm grateful for watching this series and I look forward to the Team Flare arc.

Except Ash loses all the time. 

And this defeat makes no sense.  Ash had a type advantage AND Charizard should have been chipped down by attacks from earlier.  The only explanation for his loss this time is that the writer reached through the fourth wall and gave Charizard a shot of steroids and sucker punched Greninja when no one was looking.  In short, the episode should have ended with a pic of the writer posed like this:

I mean if they want to build up to him winning with two seasons thats all well and good...if we weren't already on the SIXTH league going on SEVENTH.  And if the loss made SENSE.

To be quite fair, Greeninja is not a water powerhouse. Ash's never used hydro pump (that i know of) and, without priority, water shuriken is not that good.
The real issue was putting Pikachu's thunderbolt on top of that. Heck, that attack alone should have been enough to cut 50% of Charizard health. The worst is that, due to the cut from one episode to the other, it looked like he might have been thunderbolted twice... That's BS

Goodra was also heavily missplayed by the writers, but considering the way ash beated Aegislash in the prior battle, it was at least acceptable for him to missplay one pokemon.

Well, all things considered, Alan is much more battle hungry than Ash. It should be expected for his pokemons to be at a higher level, but still, really bad end.