Actually, it could be one of the best written CoC awakening of the manga.
The "stifled spear" hint was left by Oda since Baratie (it's obviously a retcon, but well connected) and his character growth started since WCI, 4 arcs ago.
It will be something related to his will of protecting the weaks, so not a "conqueror", but more a kind king who helps his people.
If you were talking about CoC coating, well, Monster Trio are combat genius.
Sanji "invented" Diable Jambe out of nowhere, like Luffy with Gear 2 and 3 or Zoro when he instinctively used Haki against Mr.1.
Him stopping to subconsciously nerf himself and suddently unlocking his true potential is not too stretched.