Board Thread:Episode Discussions/@comment-25319479-20170705132232/@comment-734582-20170709194754

Lorenzo.r.1st wrote: they made his eye see chakra that the byaku couldn't. first of all, that is impossible, and secondly, how can a dojutsu see someone weaknesses why? that's just absurd. and now it can it see rips in time and space? like, what? As was pointed out to me (forgot who said it), Hinata was able to see spirits. There may be a link there (hinata and boruto both have a bit of Kurama's chakra, so if Hinata has some hidden KGG, that could provide the source of this power). Plus Hinata is not an active duty Ninja anymore, so the odds of her activating her Byakugan (since it doesn't auto-react like Boruto's, who otherwise would never have caught on) and catching a Ghost Incident are practically zero.

Secondly, he didn't spot the Beast's weakness. He simply spotted great activity in the Nue's chakra network. Neji could literally see Kurama's chakra emerging in Naruto's own network, and mentions have been made of the Byakugan seeing disturbances in the chakra network to detect Genjutsu. it's well within the known abilities.

Lastly, we don't know enough about the nature of the Passage in The last, but it seems to be similar to this version. It seems Boruto's eye is connected to the Nue's power (somehow), so if the Nue's chakra is what closes or opens the passage, Boruto would naturally be able to spot the closing/opening.

Again, notice that his powers are essentially a sub-par Byakugan, with far more specific applications and no control.