I do have units with LOS to his dummy stacks. Problem is he assault moves them through all the debris and rubble, so it can't strip concealment. He has a few "Death Star" stacks waiting for any Russian that pops it's head out to challenge them, and I've broken/lost nearly all my smoke capability. OBA use here is also very difficult because of the close proximity to the enemy and poor observer LOS between the factories. He does also use them—as someone pointed out—to search for HIP/Concealed units. I guess the rule is simply meant to factor in advanced scouting.
I should also mention that what started out as a simple flame, has now grown into an enourmous fire disaster over several days that has burned down/ gutted over half of the factories (The fire spread/flame rolling is ridiculous). The wind has been gusty, and there's a huge wall of fire between us, which keeps forcing ME back. It 's giving the Germans easy terrirory, with no casualties. God, I'm prayin' for rain. It's hard enough to fight the Germans—I can't fight Mother Nature too. Regardless, it's still been for me the best ASL/gaming experience...