You also gotta think in terms of the power being transfered. 3 dretches may kill one human and have a partial (unusable) evo each, while if a human kills 2-3 dretches he has 300-450 credits. That equates to a lasbattery/armor getup(meaning if he can rifle 3v1 dretches in the first place, aliens are screwed), which continues the spiral of the imbalance. If there are an equal number of humans and aliens in atcs hall, (dretches), and the humans are covering eachother properly, no force of dretches stands a chance to have power transfered to their team.