Buu being universal is bull. Just because there's a line of text, doesn't mean he is. Not going on the fact Toriyama forgets shit all the time, Goku is probably referring to the fact that if they lose, there's no one else to even come close to being able to stop Buu.
As for the MFTL shit, no. There still isn't any evidence of anyone that's not Whis doing that, since every time Beerus traveled, it's with Whis. I've already stated that Whis is, so far, the only character to show FTL travel, not using instant transmission. And I know Whis was training Goku and Vegeta, but considering that he was still trying to drill into their heads their own weakness, and the fact they don't seem to get along as well as they should, I doubt he's even gotten to that point yet.
As for the new death battle...it should've been burried already and left alone. Weebs are going to cry and rage, as usual. Superman is OP as fuck, and broken beyond belief. He really has no limits, because if he did, we wouldn't of been graced with Superman One Million...which is the poster child of OP bullshit.