while i agree that the recent development in the manga is kinda retarded,
i don't think there is a plot hole, because we did know that obito pretend to be madara before the real madara actually come out,
now obito stated that he was the one who encourage yahiko to create akatsuki and gave nagato the rinnegan but he said all that when he claim himself as madara right ?
we can easily assume that what he's talking about is true knowing that madara is alive to the point of nagato childhood right ?
so that's mean obito stated the truth as madara spokesmen,
it doesn't mean that obito use some kind of time travel method via the boulder and get back to the past, madara simply save his ass and brain washed the brat and turn him into the man that we know now,
in other words, tobi/obito knowledge coming from madara knowledge its just that simpleU_U
i don't think there is a plot hole, because we did know that obito pretend to be madara before the real madara actually come out,
now obito stated that he was the one who encourage yahiko to create akatsuki and gave nagato the rinnegan but he said all that when he claim himself as madara right ?
we can easily assume that what he's talking about is true knowing that madara is alive to the point of nagato childhood right ?
so that's mean obito stated the truth as madara spokesmen,
it doesn't mean that obito use some kind of time travel method via the boulder and get back to the past, madara simply save his ass and brain washed the brat and turn him into the man that we know now,
in other words, tobi/obito knowledge coming from madara knowledge its just that simpleU_U