Are skills they've removed from jobs still somewhere in the game data?

Examples:

Butcher's Block
Power Slash
Mercy Stroke
Ageha
Dancing Edge

That's just a few. I'm just curious, if they're gone from our bars and lists, but still in the data, do you think there will come a time when they reuse them as "new" skills?

A lot of folks do miss these skills or other skills, and they know that. It seems a shame for them to throw away the work of the animators and stuff by just deleting those skills.