I don't see Mega Kang on that list. Was he banned to Ubers?
Him, Mega Luke, Baton Pass on more than one pokemon, Blaziken, Mega Gengar, Swagger, Deoxys Normal and Attack
Currently suspecting Aeglislash
Haven't kept up with the metagame at all in any way though, only have a vague idea of what's going on
I think for Baton Pass there were some really crazy Baton Pass abusers throughout the tier making crazy BP teams
Mega Gengar had not too do with killing a huge amount of pokemon or being a broken sweeper, but rather being a broken support pokemon, able to selectively kill 1 or 2 pokemon on your team, which may have been the only counters to your Azumarill on your team, etc.
Mega Luke had to do with being screwed if you guessed Swords Dance or Nasty Plot or other sets wrong and being possibly devastated + just being powerful
Swagger had to do with swagger teams centered around Klefki and the fact that without it these teams are crap and the fact that Smogon in general doesn't like the game starting to become a game of chance (fine with a certain level of it, part of risk/reward, but people were apparently winning out of ridiculous situations)
Mega Khan, both Deoxys too strong
Blaziken still had enough that got him banned last gen to do the same again (1st ban this time around actually), even with the new found ubiquity of SE priority (although at the time only Talonflame and Azumarill were used that much), plus even though no Sun the ubiquity of rain was gone
I think this is all what happened
EDIT: Oh, it was possible for Blaziken to use Baton Pass with Speed Boost this gen, and he's already extremely powerful for a speed booster, especially when compared to the other two speed boosters that can do that, Scolipede and ninjask (Ninjask i actually really tough to use and situational these days for most teams)