Isn't the new path cost for the Green Naga bugged? I was playing around with Green Naga for Miasma Ctis, and it seemed I was double charged for the 2nd path...
Anyway, nice strat for Jotun, I had fooled around with the Woodsmen as well, though I went water9 nature4 with a Son of Neifel. The quickness was pretty nice with them on the flanks (as you say), and since most (if not all) of the commanders are sacred getting quickness on them was nice too. Actually I think I was using the Neifel theme where maybe more of the commanders are sacred, I can't remember the other Jotun themes anymore since I'm addicted to Neifel Giants
My biggest problem though was finding something useful to use all my water magic on, the summons just didn't seem as 'cool' (heh
) as other paths. I usually set up some blood anyway, though that's probably sub standard for Jotun, but Ice Devils do fit in pretty well once you get to them.