GW PvP Packages - What's the diff?

On the PvP package sales descriptions, it says that Nightfall/Factions PvP Packages contain skills to -8- professions (2 new, 6 core).

The Prophecies package contains skills to the 6 core professions.

Does that mean that buying the Prophecies PvP package is useless, since you can get the benefit by buying Factions/Nightfall PvP packages instead?

What does the prophecies PvP Package have that the other two don't?

Prophecies-only skills?

i forget the numbers, but there are core skills, and there are campaign specific skills. All unlock packs unlock the core skills, along withe that campaigns skills.The prophecies packs benefit is prophecies only skills

sorry, double post

Here is the link to the Skill Pack description on wiki http://gw.gamewikis.org/wiki/Guild_Wars_PvP_Edition

See the note at the bottom of the page for number of redundant skills, which is less than the total number included in the Prophecies pack.