I think believing that Blackbeard was referring to shaking the planet is an inference. He could be referring to something like: "I'm so powerful now that I feel capable of conquering the world".
Not really, because instantly when he got his power he started sending Tsunami's to other parts of the already ginormous grand line.
Btw, you're trying to scaling feats by kanji? I've never seen this before and it seems very very strange. Even why, in the chapter where the Mother Flame was used it is also said that there has never been an earthquake of the same proportions recorded before — This should refute Tsuru's point completely as well, since she would record WB's earthquakes watching his fights with Roger and Garp. She probably used hyperbole or assumption.
Mother Flame point is weak. It had planetary range and a ridiculously high magnitude. The point was the yield, not the range.
The kanji argument is used to elaborate on phrasing. The only time a "destroy the world" statement of that caliber in One Piece is stated is for the planetary weapons
Quick question: what’s the implication or statement that this is with a single attack? I think that’s a rather important presupposition built into the claim made by the OP, and worth discussing. Especially since we have these FTL characters capable of attacking at FTL speeds.
Respectfully, having stacked range is the stupidest thing I've heard in a long time.
Saying you need to stack shockwaves to get further range straight doesn't make sense.
To explain further what I mean by that, other world destroying weapons like mother flame took 6 days or sumn for the effects of the attack to hit the OP planetary ranges, a character moving at light speed could reach the sun from earth in 8 minutes. Point being that these super fast characters don’t need a massive attack to deal massive amounts of damage via smaller attacks at an insanely quick time scale.
Cause shockwaves move slow in the grand scheme of things.
To reach the middle of the OP planet, it'd take 17 days for a shockwave to go from 1 part of the earth to the other.
A character moving at lightspeed could circle the entire one piece planet in 10 seconds.
We don't know the mechanics of the speeds of the residual shockwaves of the Mother Flame. We know the mechanics of the speeds of WB's quakes, which have actual feats of fighting people faster than sound.
Also, this is specifically range. Talking about damage is unwarranted.
The reason I ask this is because BB says that he’ll control the whole world by starting with Marineford, which to me indicates some kind of progression, as in BB goes from one place to another, destroying them all until the world is destroyed. So I guess what I’m really asking is, what’s the proof that the Gura Gura no Mi’s “world destroying power” is by virtue of a single attack spanning the entire planet as opposed to multiple attacks that cover far less range but happen in very quick succession?
Because he wanted to destroy Marineford against the guys who were protecting Marineford?
As he was attacking Marineford he was sending Tsunamis to other islands.
It's not about power, it's about range. He has the power to destroy marineford, he just needed to get past the guys who were defending it