I think people are underestimating K.Rool's Crown Throw here. Yeah it has it's downsides that we've all discussed it's weaknesses, but the way it comes back just seems so useful to me. It seems like a good option coverage move, especially catching rolls and ledge trapping. It also seems to be possible to Smash throw it, so it has that extra flexibility as well. Perhaps it'll even be possible to use it to cover approaches. I don't think we should be dismissing it as "pointless and gimmicky" like the blunderbuss (which also could still be better then we think if the second part can be canceled).
As a heavyweight dragon player myself, I think Cloud and Marth are a pain, but if you're really patient and can play a bait and punish game with them, you can work past their disjoints. Ryu is also dangerous, but he can be out ranged, so again, he can be worked around with slow careful play.
It's the likes of Sheik and Zero Suit Samus I'm concerned for. It's hard to play a slow, patient game against a character with great mobility and frame data. Those are characters who control the pace of the match and, if they don't want to give Riddles breathing room, they don't have to. You have to anticipate their movements and beat them out before they even make them, because playing on reaction is goshdang near impossible with those two.