The MS effect corresponds to whether MS or wound poison is up - if it is, this all gets reduced by 50%. The 'player modifier to healing' is another example of awesome blizzard mechanics, where the player's talents that multiply healing done also multiply healing done to Anub'arak. So things like Purification or Master Shapeshifter (tree) boost healing done to Anub'arak.
not that that changes anything but dam.... that kinda sucks if its true.
I had not even thought of using both the 10 and 25 man ony rings, WTB 10 ony.