I get that eventually Obito would have seized control over the juubi but it felt like 2 chapters were wasted. As for Naruto saving Sasuke by using his father's skill was possible right now only Minato can teleport to a remote location and blow up but it will pull him out of the fight. As for what happens next....
Naruto did'nt use the FTG justu he just made sure he was touching his dad and Sasuke for Minato to do it.