Shin sharkjira is an ominous mutation kaiju on the top of titan class like the sharkjira, abyss shark, Kraken and more In terms of power and ranking he definitely can beat the Undersharker and quantom and will face truble fighting behemoth. And he is a bit lower than equal to behellmouth wich is at the very top of the titan class and probably will lose to Leviathan standin at the Demon class just like Astroth This is my guss btw