Is Ryozo Tsujimoto the creator of monster Hunter or was it someone else?
Tsujimoto was not the original creator, but instead has been the producer for games in the series since Freedom 2 in 2007. Kaname Fujioka was the director of the original Monster Hunter game but still maintains a central position in the series as executive director and art director of titles as recent as Iceborne.
I don't think he would agree with most of them. They're interested in making games that keep a relatively consistent gameplay loop (using big weapons and the environment to gain the advantage in hand-to-hand combat with large animals), not trying to keep perfect consistency between titles and feats. As such, there will always be feats that indicate a higher tier (such as Kushala clearing the skies with its wind powers) and feats that indicate a lower tier (such as being able to drop crystals on Kushala to knock it over and break its parts).
Due to the nature of this wiki, we're almost always going to stick with the highest showing and handwave or underplay lower showings. Conversely, I'd expect a director to go by the "average" or "expected" showing for such things, and as such, if a person walked up and asked whether a Deviljho could no-sell the entire world's nuclear arsenal plus twenty Tsar Bombas in the face, I think they'd say that it wouldn't. If someone asked if you could drop a huge rock on it to injure it (somewhat), they'd probably say yes.
There's also the fact that in cutscenes and as established in the world, despite being capable of great range over their powers, elder dragons don't just utterly evaporate the ground or monsters they smack (an idea the developers would find amusing at best) despite our verse saying their AP is high enough to
pulverize a 15-kilometer cube of stone in a single blow. It's not really an issue of range of attack, the idea would just never occur to developers. Other counter-examples:
Also, yeah. As an attack that bathes the entire castle rampart in flames, Ruinous Pyroclasm
is impressive and
is terrifying in-game - worthy of a monster who destroyed Schrade overnight. But it's absolutely nothing from our verse's standards. A
Kirin is considered far above that. The only thing you could pull from it is, like, the characters' reactions to it as scared. I think that if someone asked what's the strongest attack a monster can bring, the developers would say either that or Sapphire of the Emperor.
Obviously, they show that there
is a gap in power between elder dragons and stuff like Rathalos, but they wouldn't believe that the gap is as wide as we have it. A monster can still mostly no-sell or clearly demonstrate superiority to another while being on a similar tier, or just above it. Plus, anything capable of burning down a small town by itself would be treated as an elder dragon-level threat, so it's not like they
have to be High 6-C to be in the place they are, lore-wise. You could do just fine with, like, 8-A or Low 7-C.
It's also worth mentioning that unlike media with a single writer or a central story writing team, game directors and directions vary widely between titles in a video game series, and it is possible that one director's idea of a monster can differ greatly from another's. If a monster in one game obliterated a mountain with a single twitch, that has no bearing on whether another game treats its local elder dragon-level monster as any less or more dangerous, especially if directed by entirely different people.
I think that the wiki's ratings are really more reflective of how we vertically categorize monsters, and the specific numbers/tiers themselves aren't so important. The developers would probably agree with that.