I believe he would make a difference, his battle experience and his techniques are something that shouldn't be taken likely, however ... i don't see him being that much of an asset in terms of making a different to the out come of the battle.
Although it all depends on what he can bring to the table because he doesn't have much knowledge on Obito because he doesn't know who that it in a sense.
He would be able to help come up with different tactics during the battle as things come up, kakashi can do the same job as him i believe with the same sufficiency although they both have different skills which would help in different scenarios plus two minds are better than one.
They end point would be yes i believe he could make a difference in the battle, however the question is can he change the outcome?