Did you not read what i said? Because it's obviously better to use all your manpower instead of part of it. Why possibly fail on his own when he has two people with him? that'd be stupid since they had 1 shot at it. Atleast if that failed, they'd know it couldn't be destroyed period. IF he used yasaka on his own and it succeeded, then good. But, what if it failed? It's just an obvious reasoning but you just want to try to diminish him looking past the obvious.@Bold. No. If his Susano'o is so great, why did he need help from Naruto and Bee hmm?
Still doesn't get past the point about CT not crushing Susano'o, but alright.Nagato can control the direction of its shinra tensei like how he lift Hinata up in different directions.
Shinra tensei is like telechenesis, he can direct Itachi anywhere he wants towards the center of the gravity.
Watch this video to give you an idea: