Board Thread:Boruto Discussions/@comment-33255203-20171004210031/@comment-734582-20171009113724

UntappedRage wrote: The sad thing is we have nothing to gauge adult Boruto's strength. For all we know he is leagues below Naruto, and Konohagakure (kind of inclined to believe the other villages were destroyed as well) was destroyed after some long prolonged conflict with the Otsutsuki, not Kawaki. Considering the village isn't a giant smoking crater (see Pain's attack) but in stead we see battle damage, numerous smaller craters and smoke and destruction everywhere, i think it's fairly clear that some sort of protracted fight took place, not some giant showdown.

We know nothing about adult boruto because it was just a teaser to keep fans talking (which is both what a teaser is for, and boy it worked wonders).