Shinra tensei is S-rank

[LUMOS ULTIMATUM]

yeah cuz look at kirin.

the dragon alone is like the size of konoha

How is this konoha size?It looks like it has the dimensions of the Hokage building.

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[Prime Rib]

Most likely yeh

 

[VolatileSoul]

Bloodlines have no rank. What's more, Shinra Tensei's power varies. It can be strong enough to flatten a village, and weak enough that anyone with good footing is virtually unaffected by it. Still, if it were to have a rank, it'd be S rank.