You have to think of this way.
When a kid gets a new toy, they usually ignore the older toys for the meantime and spend A LOT of time with the new one.
Same goes for Madara, he's just toying with them so he wants to play with them the right way haha.
That, and the dragon wood is what restricted the Kyuubi from further helping Madara so he's bound to use something similar in restraining Kurama.
That's what I think at least.
That, or he deeply misses Hashirama since he was his only best friend :C lol
It's good that they're showing Hashirama's powers though, imagine the real Hashirama unleashing those with his many other jutsus
