yeah, but 15 beats him because he has Decade's power plus five guys Decade can't turn into.

so canonically, 15 is stronger than Decade.

Guys we all know that the strongest Kamen Rider is Kamen Rider Jun, so this entire debate is irrelevant :lol

I only used Decade as an example because, despite what the series constantly tries to hammer in, we never see such a display of strength. He loses on multiple occasions.

Outside sources try to constantly tell us that Kuuga is an immortal, unstoppable force that can wipe out a planet.
But in an action-drama, that leaves for little tension, so Kuuga has to get knocked around and beaten.
In doing so, it leaves a massive disparity and someone trying to have it both ways. Kuuga can't be quite decidedly defeated by the kabuto Grongi and then have the show tell us he's supergod that can obliterate everything by lightly tapping it with his foot 2 episodes later.

That there is a flawless argument :lol

How could I have been so blind?

Guys you are all looking in the wrong direction.

You need to look more forward as the most powerful rider will be whoever is the most current ;)

Or whoever's toys sells the most. ;)

I don't know how the others did but ryuki's did well and I am very glad if ryuki was the strongest :D

Nah. Otherwise it'd be, like, Den-O or W. Den-O appears in like everything and they kept making those Gaia Memories for years.

Whoever's strongest is whomever the hack writer at the time arbitrarily decides, or is mandated by Bandai.

Of course. No good putting over a show that's 15 years old if you ain't gonna shift all those new toys you've just made!

My personal theory on Kuuga is this: As they uncover more about the nature of Kuuga, and the Grongi, there's this idea that Kuuga is supposed to be a purely destructive force. Thus it stands to reason that Ultimate Kuuga is Ultimate Destruction. That's not accounting for a shared universe, though. That's a world where the only "Rider" is Kuuga.

Honestly though, I'd be interested to see where it is established that Ultimate Kuuga could destroy a planet with his kick. Is it mentioned in some book or other additional material? They don't mention that in-show, just that Kuuga is supposed to be a "Living weapon", and of course we see the explosions of Rising Mighty and Amazing Mighty's kicks...