Almost every twin on the market has been "directional" meaning different tip/tail profile as opposed to exactly equal height tip/tail. Until two years ago Line was the only brand that even made a "true twin" ski.
Directional twin doesn't mean directional ski the way a swallowtail ski is directional, or a directional freeride snowboard like the fish is.
Saying the Prophet 80 isn't a park ski because the tail is a few mm shorter than the tip is like saying the Trouble Maker is not a park ski for the same reason.
The only reason Line changed the way they marketed the Prophet 80 this year is because they came out with the Chronic Blend and were planning on having the Anthem. 5 park skis is too much overlap to market, but the truth is the 80 is a far superior ski in the park than the Chronic for instance, not to mention it way outskis it all mountain.
And before he went to K2 Bibby was killing it on the 80s and even one a Slopestyle pro comp, though I can't remember which one.