I agree with you completely except that in my opinion:
Madara with Rinnegan would be #1.
Hashirama would be #2.
Naruto would be #3 not Obito.
Nagato would be #4
Tobirama would be #5.
Minato would be #6.
Killer B would be #7
Itachi would be #9
Obito would be #10.
*Sorry for bumping an old thread but I havent been able to get on lately to reply to threads.