Obito states that Hagoromo's sword, the Nunoboko, created the world, and then Obito claims he'll use it to obliterate the world[1].
In the raws, Obito states that he will use the Nunoboko to erase the world[2]. The kanji used,
消す, is the verb for "to erase". Indicating that Obito is going to literally destroy the world. This is likely referring to surface level destruction,
183.24 Petatons. The reason I believe this is due to the prior part of the Nunoboko statement regarding Hagoromo creating the world. I believe this is in reference to Hagoromo having to terraform the surface of the Earth, given we know
the Juubi razed the surface of the Earth with numerous Bijuudama[3]. I can make this claim with a high degree of certainty, because bombing the planet, in what is akin to nuclear fallout, would make the Earth simply uninhabitable for humanity and the traditional wildlife. Furthermore, we know Hagoromo was born on the planet Earth, meaning the planet existed before Hagoromo. Therefore, Hagoromo couldn't have created the literal planet itself. This leaves the most likely interpretation of "Hagoromo creating the world with Nunoboko" to be terraforming the surface in order to make the planet hospitable again, or in other words, undoing a surface level destruction of Earth. In which case, if the sword can restore surface level destruction, it is consistent for Obito's statement about erasing the world to be in reference to enacting surface level destruction upon the planet. Thus, Juubi Jinchuriki Obito should be
High 6-A with the Nunoboko.