I have a couple of questions that would be very interesting to see peoples answers and thoughts to them. Here they are,
If Obito uchiha does infact have a change of heart, Would he stand a chance against Madara?
Would Obito have control of the jubbi and use it to his advantage?
Could he un-summon the jubbi since it was him who summoned the jubbi in the first part?
Would he give his eyes to kakashi if he does infact die in the hands of madara?
Does obito know the edo tensi since kabuto taught him it.
And finally, Would sasuke even be any help to the alliance since madara is a stronger version of sasuke?