You guys are overcomplicating the shit out of this. There's a power form and a speed form. Just like G2/G3 you have Boundman/Snakeman. Tankman is just Fuusen.
"No, but this is 73% of the way between Boundman and Snakeman in power, but is's 37% of the way between Snakeman and Tankman in speed"
Hyogoro stated Boundman looks like a Guardian Deity (as Kaido is stated to be for Wano), and was training KKG for him. Boundman will fight Kaido.
Oda is giving Luffy a new Gear 4 or new gear as a whole
He's used boundman lots of times vs kaido and failed so no need for it to win now.
Oda is giving him something new we haven't seen.
Btw Tankman isn't just fuusen, you are confusing it with "full version" he used against Cracker
Boundman is a balanced mode : power + speed + defence :
Boundman is based on Kong (gorilla) per the named moves (KG , Kong gatling, Kong rifle & KKG) It's a balanced mode!
Luffy used 3 other named moves which never made sense for a "Kong" mode : Python, Leo bazooka and Rhino scheider. These 3 moves gave us hints to future g4 modes
Snakeman is based on snakes ( named moves: python, black mamba, cobra) a reptile. Its a speed mode.
Tankman is based on Crocodile , Rhino & Hippo, Tanky mammals. I think normal Tankman uses named moves like rhino schneider, etc... a Tanky mode
Tigerman/lionman will have big cats named moves : leo bazooka, ... Power mode
G3 uses elephant named moves...now time Adcoa/adcoc it has Mythical bird moves : Roc!
Red Roc is g3 version of red hawk. Still has "roc" though
The new Gear with AdCoc will have "roc" prefix or some other but the finisher will have "King" prefix to it coz Every Gear 4 mode has "King" move as finisher.
Boundman for Doffy
Tankman for Cracker
Snakeman for Kata
Tigerman to finish Kaido
Awakened Gear to defeat Teach
Oda won't have Boundman defeat any major villain again. Maybe Akainu if he ever fights him.
It failed many times so why make it win vs Kaido?
Oda has been making Strawhats use new loves to win : Sanji got IJ, didn't win with HM or DJ, Zoro didn't win with ashura or Sanzen sekai, he got En'Ou, Jinbei used a new secret move.
Imagine thinking Luffy won't use a new Gear or new "King " move to beat Kaido