The battle on the moon went smoothly for Klaus' team because their odds were much greater than the Lunar Beasts. They had more Tier 11 members than the Lunar Beasts, so while the Lunar Beasts were superior in numbers, Klaus's team had the advantage when it came to combat power.
But today, they don't have such an advantage.
The number of Tier 11 zombies had crossed seventy. But they weren't the only Tier 11s; a few Tier 11 beasts were fighting for the zombie side. So, it was safe to say that the Tier 11 humans were outnumbered by several dozen.
Then came the Tier 10, where, by count, the zombies outnumbered the humans by several hundred. That alone showed the odds were much more stacked against the humans.
Not forgetting the thousands of Tier 9 and Tier 8, the Transcendent zombies may not seem like much, but when they come at you in numbers, handling them becomes difficult and dangerous...