To start, I think his CT cost a lost less chakra to cast than for instance Nagato's: it lacks the miniature black hole that is the center of CT.
Some say Sasuke is using the Bijuu as core, which is nonsense, as the mass the bijuu exist of can't be heavy enough to cause a gravitational pull anyways.
I propose to see Sasuke's CT as raising the rocks and earth and simply compresses them instead of the first versions we have seen. This comes closer to Madara's meteor jutsu than it comes to Nagato's CT. Perhaps it's just to remove the Bijuu temporarily. Don't forget they are under genjutsu as well. Otherwise they could most likely break out on their own.
It ain't all that.
Some say Sasuke is using the Bijuu as core, which is nonsense, as the mass the bijuu exist of can't be heavy enough to cause a gravitational pull anyways.
I propose to see Sasuke's CT as raising the rocks and earth and simply compresses them instead of the first versions we have seen. This comes closer to Madara's meteor jutsu than it comes to Nagato's CT. Perhaps it's just to remove the Bijuu temporarily. Don't forget they are under genjutsu as well. Otherwise they could most likely break out on their own.
It ain't all that.