True enough, if you were even thinking about the auto fallback crossfire use scourges. Let the enemy move towards grotesques, charge them, win, autofallback, and then have had your scourges fly up behind them/ or deep strike, or whatever so they are there w/ 4 SC's. Just my theory, or you could use a raider squad, or anything else with the firepower that you can get in there fast... which isn't too hard with the DE.