Board Thread:Versus Debates/@comment-36394790-20180824122210/@comment-26636534-20180830213255

CombatIQmatters wrote: It isn't cherry picking in the slightest. We haven't seen those two users use it. But no statements, no feats, indicate that izuna and shisui were incapable of using susano'o. Not seeing someone use something =/= they can't use. There is no manga panel of shisui even battling anyone on screen. Izuna's screen time with MS in battle was limited to being being blitzed by a hirashin user, and that could have happened through a number of ways. So, no Izuna and Shisui aren't to be included as a counterargument to sasuke's statement because we don't have enough information. Including them is grasping at straws. You are basically say oh we didn't see these users use it, therefore we can't make a blanket statement. By that logic, we might as well say that izuna 's sharingan was incapable of copying ninjutsu because we haven't seen it happen, when we know that is an established ability of the sharingan through character statements/feats. You do realize that even in the real world, nothing is 100 percent provable, that's why science is an ongoing process, so we always have to go on on the information we can percieve and make the logical conclusion. If something quacks like a duck, walks like a duck, looks a duck, its a duck until proven otherwise, and its extremely unlikely for there to be another possibility.

He does have authority. If I know that earth's graviational field yields an accleration of 9.8 m/s^2, near the surface, did I set that rule? no. But It's a fact. The fact that he can even use izanami in the first place indicates he is a valid source on the hidden abilities of the sharingan, just like obito and madara. Just because you didn't set the rules doesn't mean you don't know them. Itachi clearly stated when he awakened his eye powers in both eyes, the third power emerged, susano'o. The same thing happened when other awakened both eye powers with their MS. It's a pattern, backed up by statments and feats. It is cherry picking, since you are excluding unproven claims based on a blanket statement. I'm not grasping at straws, the argument is fails for Izuna and Shisui.

Your comparison to copying ninjutsu is incorrect as I understand the difference between a kekkei genki and a supposed additional ability. Your other comparison of science and ducks, well, science is built on reliable results, since there is no "result" for Izuna and Shisui you can't make that statement.

Itachi doesn't have authority because he doesn't know, all he knows is the what he was taught or read. The earth's gravitional field yielding an acceleration can be measured (shown), that's why it is reliable. It is a pattern, by the pattern is missing for Shisui and Izuna, don't falsify data for them.

Note: Have to point out you were grasping at straws with the ducks, gravity and copy ninjutsu.