Neightrix

"If you Exfiltrate instead of dying to zombies, your points are nearly doubled..."

The pre-release must have been wildly different because that's not even close to how it is at release. If you enter at rank 1 and barely get to rank 7, and exfil, you end up with less than half the bar towards rank 8. Exfil is worth about the same as just finishing the next wave.