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This is clearly payback for getting left behind in Resurrection "F"
Yeah, it's a pretty good design. All credit to Katsuyoshi Nakatsuru!
Per interviews, Toriyama came up with the Potara because Goku+Vegeta already used the Fusion Dance in the movies.
Never forget, Toriyama did all these poses himself when drawing the manga. For reference purposes.
If there's one thing DBZ has taught me, it's that jump-kicking someone from the side is an unblockable super move.