You see how long it takes for that technique to even take affect.how will hashirama counter chibaku tensei he hasnt got Naruto and Bee Next to him im sorry this is a bad match up for Hashirama anyway just look at the video and put Hashirama in that situation
Itachi and naruto and bee was basically having a consversation while Nagato was using Chibaku Tensei.
Anybody can just immobilize Nagato while he has his hands together, using Chibaku Tensei. Example: PAin uses Chibaku Tensei, since it takes forever for it to start, Hashirama crushes Pain with a wood style technique . He will not stand there and watch like a dumbass. He would just appear behind pain and attack before chibaku tensei fully activates.