Yep, I just ran a test myself. Separate medic and woody healers do not stack. Wow, I always assumed woody and medic stack on different healers. That is good to know. However, in my test with a Medic III guy and a separate Woody III guy healing a hurt Knight separately had the exact same results. Not sure why you got different results. edit: yep..that adjacency effect is nice and something I really never payed much attention too. I still like the Woody III route first better as it does other nice things. But it is all about opportunity. If I don't get a warrior promoted up I don't bother.