[Neomi]

From what I understand, the denizens of Watcher's Keep (like most parts of the game) are adjusted in terms of strength and composition based on the party's level. Not that a group straight out of Irenicus' dungeon would be able to get through it, but there may be a big difference in what you face with a level 10-15 party than a level 15-20 party.

In other words, you may get more xp (and possibly better spoils?) if you run through the keep later during TOB.

I've also read on this board (not sure who to quote, sorry) that there may be more party dialog if you go through WK during TOB rather than SOA, so you may be missing out on that too. I don't think I've paid close enough attention to tell whether that's true or not.

Never fear, the keep will still be accessible after you finish off Jon-boy and begin to live out the prophecy, so my advice would be to leave the rest of the keep until later and soldier on towards Suldanessellar...