Lucas being brought back later doesn't mean he wasn't also cut. It's not like DLC was decided from the top as it probably was this time around. That's 1/3 of the cuts.That only really applies to Brawl. At the end of Smash 4, the only missing clones were , while and (who needs more dev time than a simp clone) was still cut.
And three of those cuts were atypical considering technical limitations aren't a recurrent factor for veteran cuts. If the 3DS wasn't part of the picture, derivative characters would've constituted 2/3 of the cuts. Also, it would bring the original Nintendo character count down to zero.
The other third is from what I'm guessing will be the only category that can challenge derivative fighters going forward in terms of quantity of cuts, third-parties.
But I guess we can put a pin in it and see if any categories are disproportionately cut next time the axe comes down. My feeling is that there will be.