The Reason Obito overpowered Madara and The 10 tails...
Orchestrated the war, f*#ked up those mist ninja...
But once he had seen that Rin exorcist face he was solo'd instantly :L
"I'm watching over you"
I like how Rin symbolizes a guardian angel to Obito.
There's two possible scenarios to whether he takes Naruto's hand or not.
1.He rejects Naruto due to his passion for Rin and this dreamworld.
2.He see's an apparition of sorts in his head of Rin, scolding him for...
Hashirama wouldnt "smash" he probably win unless nagato brought tendo closer to his current location for a stronger signal, one chibaku tensei or mega almighty push what get the job done, Nagato himself could win against hashirama.