Exactly it was a rinnegan genjutsu then.Why it should be sharingan pattern, when the eye that was used to cast genjutsu was Rinnegan?
Better prove it before stating it to be a fact.Sasuke used his left eye which is Rinnegan that's how controlling genjutsu works on bijuu's, their eyes will always reflect eyes of caster's genjutsu. It was sharingan power but used through Rinnegan, hence why Rinnegan pattern was reflected.
Sharingan could control one bijuu at a time is also a fact.Sharingan can cast visual genjutsu on bijuus and their eyes will reflect it = fact
More speculation than fact unless you prove that Sasuke's was sharingan genjutsu for certain.No Rinnegan user ever casted a visual genjutsu = fact
Agreed.Sasuke Rinnegan possess Sharingan/MS powers = fact
Pein contolled his summonings using path and they all reflected the rinnegan pattern fact. So a rinnegan genjutsu should also be able to do that not to mention the bijuu's affected by the sharingan genjutsu are being mind controlled, we don't see that in the bijuus affected by Sasuke's rinnegan genjutsu. They're conscious but without any control over their bodies.Bijuu's that were controlled by Sasuke reflected the same eye that was used to cast genjutsu(sharingan genjutsu trait)
Sasuke was the first to have rinnegan genjutsu so obviously Madara had to switch to EMS to cast genjutsu.I think it's pretty clear now?
Madara made it even more clear when his wood clone had to switch to EMS to cast genjutsu, because Rinnegan doesn't have genjutsu ability, unless you have a hybrid eye like Sasuke does, then you can use sharingan powers with/through Rinnegan.