I never mentioned Shishienjin, but Obito's barriers. Each person makes one wall. You can't compare that to the seals.
You really are slow... when did I say you mentioned shishienjin?
I said, "think of it like the seal the 4 kages used".
You said, "It was never stated you need 4 people for that seal, obito did it himself".
I proved to you w/ scans they were 2 different jutsu AND manga does state you need 4 people. (You = wrong; me = right)
You said, "It's not stronger than Obito's" <--Completely missing the point.
This is seriously the last time I'm going over this w/ you so let's just drop the whole seal thing.
Are you saying 1 person can't make a four-sided wall? Have you seen stone ninja's?
Basically it could work like this: You need a person with sun seal and another with moon seal. The two forces have to come together with the target in the middle. That's why it requires two people.
Indra had a normal sharingan. He should have known whether they can read it or not.
Indra's sharingan was obviously a lot stronger than modern Uchiha's for obvious reasons, he had PS after all.