I don't envision Daisy as a Peach clone AT ALL. The only similarity would be the fluffy dress costume, but we cannot forget the fact in recent times she's been most recognizable as a spunky daisy-duke-wearing athlete with a personality (and gameplay feel) whose ferocity that Peach cannot match.
I remember in the original Smash Bros, Captain Falcon was a sort of skeletal clone of Samus' basic moveset.
Fast forward, and think "Daisy is to Peach" as "Captain Falcon was to Samus": less floaty, more speed, more impact, more straightforward.
Peach already has a golf club/racket/pan/herpes? Big fucking deal.
Let Daisy carry a club/racket at all times (allow them to switch?). Let her have that extra reach to express the extra effort and power (brutality) she'd display over Peach in Mario Power Tennis. Let her tap into the personality of the Mario Sports universe Ninintendo has been re-hashing-re-milking all this time. Hell, let her be the Casey Jones of the game (homeless vigilante warrior ftw). Inundated with sword fighters already? Hell, add a sports girl a Bad Girl into the mix.
Lucas, Dorf, Ike, Wolf, Falco, blah -- It's sickening to see Sakurai aimed to fill the roster with clone pairs. Dorf, Pichu, Lucas, Young Link seemed to be introduced for the sake of functionally cloning the original roster. It's WORSE that he went ahead to bring Ike despite already having Marth & Roy, and Wolf despite Fox & Falco (my Captain Falcon will have to personally BBQ all these StarFreaks over WiFi).
The supposed "deleted character" roster doesn't improve my opinion of what Sakurai "originally planned for the roster", either. It's just more clones or obscure/underdeveloped Nintendo history.
Daisy was a missed opportunity.
Enjoy your top tourney matches and your top 20 YouTube vids featuring StarFox characters for a 2nd generation in a row, bitches.