I think it all depends on what areas your think you are weak in. It sounds like you are satisfied with strentgh and are concerned with speed and endurance.
Keep in mind that you have to train for effect. If you want your speed to improve you have to use some type of dynamic effort protocol. And I may be way off base here since I don't know the exact type of MA training you'll be doing, but isn't it, in itself, going to increase endurance? If you're thinking about speed and endurance, and you don't think it's overkill, then that's one thing. But on the other hand, if something IS covered, then that might allow you to focus additional training on other weak areas.
An article that may help:
Charles Staley
Alwyn Cosgrove
(His site, with the Metabolic Power Training article also)