You don't need grishnack for the allied orcs, they can be included in an isengard army without needing an orc captain to lead them. I've played against uruks with only captains/lurtz and it works fine without saruman as long as you have the right amount of heroes to make it work.
Luckily for isengard players there is a hero to lead each different part of a force. Lurtz can be fielded anywhere in the army and perform well, however he works best with scouts. Mauhur should be used to lead beserkers or ferals, he can get them to where they need to be nice and quickly. Keep ugluk with cheap warriors, incase he needs to behead anything, a shaman is essential for keeping an army together (and necessary for allying isengard raiders with the legions of the white hand). Standard captains should be in the shieldwall, you only need one captain and a shaman to have a pretty solid, unbreakable battle line. I wouldn't bother with sharku, use Thrydan Wolfsbane on horse and a mounted nazgul to lead the warg riders, transfix an enemy hero with the nazgul and thrydan will atleast deplete their fate with his mighty blow rule. Vrasku is incredibly good, he can shoot like murin or haldir, but has more strength (in combat and at range) and is cheaper, what a don!
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