[quote=@ActRaiserTheReturned]
<Snipped quote by Cyclone>

Well, they're basically only skeletons, and if Ialu fulfills Sauranath's requests, he will have all of his soldiers wearing dragon scales and dragon leather anyway. So, if he just gave permanent control of the dragon skeletons over to Ialu, the other undead will be like new borns trying to fight grown adults. 
[/quote]

Thulemiz' undead themselves might be like newborns, but see how much of a newborn one of the Silent Six is, when they dispell the magic that keeps the undead dragons alive. I'm pretty sure one of the SS could neutralize a bunch of the undead dragons if given enough protection from them.