NOT AN OFFICIAL ANSWER:
SERIOUSLY, I'M JUST A FREELANCER AND CAN'T REALLY TALK WITH AN AUTHORITATIVE TONE EVEN IF I WANTED TO:
NO KIDDING, ONLY MY PERSONAL OPINION FOLLOWS:
There's a long and proud history of PC versions of things not necessarily working just like NPC versions of things. Once you include player character Ghouls, Drakes, Shapeshifters, Free Spirits, AI's, etc, it becomes necessary to either (a) gimp the NPC versions of all of them, to make them match up "balanced" PC versions, or (b) just accept a discrepancy and move on. The things you need an NPC version of a monster to be able to do, as a character in a given sourcebook/adventure/plot/scene/fight, aren't necessarily the same as what a PC version of a monster should be routinely capable of, in a game that's got vaguely balanced player characters.
Personally? I'd say the NPC werejag stats have nothing to do with the rules for running Shapeshifter PCs, and call it a day. If I did automatically give all PC Shapeshifters a second IP (for whatever reason), it wouldn't stack with Adept powers, I'd let them have whichever was better (IE, don't buy the Adept power unless you're getting level II or better). I wouldn't get hung up on Concealment, either, or allow PCs to take it -- because it seems to me like it's there to just make spooky South American werejaguars particularly scary and characterful. Not all PC shapeshifters automatically get Survival at 5, Tracking at 6, and Unarmed Combat at 6, either, do they?
But that's just my take on things. If you think it'd work in your game, particularly if you feel Shapeshifters need the IP boost to be competitive, go for it!