lol
minato doesnt need to make space time barrier the size of konoha, MINATO JUST NEEDS TO MAKE SPACE TIME BARRIER COVER THE FRONT OF HIMSELF, SO HE WONT GET HIT WITH THE FULL SHINRA TENSAI
like how he did to the tbb
the tbb wouldve done damage but minato made the barrier big enough to send the tbb into another dimension
Boy,
Chou Shinra Tensei is a full forced ST which will act from above Minato's head - clearly Nagato will use it from some sort of aerial standpoint as he did canonically [
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]. Shinra Tensei creates a spherical wall of gravity pushing outwards - it's not just affecting Minato from one direction, because it's not a technique which is acting in only one plane, unlike the bijūdama. If he's on the ground, and he uses a S/T Barrier to counter a jutsu coming from above, not all of the Chou Shinra Tensei is going to be re-directed into the seal. It's going to be spherical wall of gravity, the S/T barrier can't absorb something coming from both above and the side. You are saying it's going to be like this [
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], when in actuality, Chou Shinra Tensei will be like so [
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].
As I said, unless Minato can create a floating S/T Barrier which just so happened to be inclined at the right angle to the horizontal and he somehow managed to make it as a wide as Konoha, he can't defeat the jutsu with a S/T Barrier.