The cannonball rain would be the DKC1 final smash, of course.
At this rate, I'm more concerned with getting K. Rool in Smash, period. Regardless of his moveset, it puts his character back in the spotlight, which will do wonders for future DK games. That said, I really hope his moves reference his different personas; his crown throw is a lock, but I'm interested to see how his blunderbuss and helicopter pack end up, considering they're used in pretty much every K. Rool moveset, ever.
A lot of why K. Rool ought to be added before (albeit, not instead of) Dixie is his sheer potential. Sure, you can toss together a few DKC items to form an alright Dixie set, but K. Rool just has so much more to offer. That, and he wouldn't be the third protagonist added to a single series in a row.