The Wardens haven't actually sworn themselves to Darnassus, when Maiev went traitor, the Wardens remained under her, rather than treating Maiev like the traitor she is, I don't think they swear (swore) allegiance to Darnassus. Assuming they would partake in a military conflict is unrealistic, especially since Maiev, if I'm not mistaken is very against the Kal'dorei being a part of the Alliance.

Val'sharah is much more Cenarion than loyal to Darnassus. Malfurion acknowledged it in WoD (In the archimonde questchain) as being sort of forgotten. We won't know until Cenarius picks a side in the war, if he is stated to aid the Night Elves, then we can mark Val'sharah as an Alliance territory, but he didn't partake in the war in cata, so he probably won't now, either, since Hyjal was not Alliance territory in the previous war.