Since he created a moon on his deathbed, he could probably make one considerably larger in his prime. No one would have a counter to a CT of that power.
Him w/o the 10 tails Most Definitely Not. Him as the 10 tailed Bijuu, then POSSIBLY. But you have to remember, even he defeated the 10 tails, so the whole world? Come on now. The Uzumaki I would think would be extremely useful.