More bodies for the flood to consume. Have we not learned how fast the flood spreads? look at High Charity in Halo2. My gosh I don't think the flood was even on HC for more than 3minutes before it was completly overrun. Floodgate in Halo 3? Aread was completly infected and John wasn't even that close to the crash site. The point is, bringing more bodies to the fight would have just made the enemy stronger. Who's to say the forerunners would even join the cause? Heck they were more than happy to sit back and study the flood for most of their war before they took their heads out their butts. I would also assume the humans were confident they could cure the flood, thus using it as a weapon in future enemies. Forerunners. [Edited on 12.09.2012 10:14 PM PST]