i came across d episode where madara was explaining things about his eyes and gedo mazou to obito. and he said d rennigan has d power of six paths and also d shadow and light style, however, i aven't seen any rennigan user use d technique or as kishi forgotten about d jutsu. my fellow naruto...
simply put, A tailed beast power is not something that can be easily mastered or use most especially if u are the type consumed with hatred. however, technically what is being insinuated is that obito was able to master and use the powers of juubi d sameday and just few minutes after it was...
byakugan vision only require training 4 u to make it stronger, while sharingan requires sacrifices like witnessing the death of someone close 2 u or killing someone close to u.
also byakugan is permanent while sharingan deteriorates the more u use it xcept u possess d ems or u do not awake ms.