If youve got motiuon builder theres no point in rigging in maya, use motion builder thats what its for.

Just make a skeleton, bind it, paint the weights then export the lot to Motionbuilder via the FBX (make sure you use the right version on export), then characterize your model with the MB character, animate, plot the animation then export back to maya.

MB has full FBIK and switchable FK/IK, its a awesome bit of kit, if you've got it then use it.