>>714670924>>714690382In my headcanon both the basestars just had a skeleton crew to act as scouts/sentries for New Caprica and neither was well enough staffed to be able to fight at full strength.
Lee wasn't willing to let his dad die and arrived to see Galactica on the brink of destruction so made the decision to sacrifice Pegasus to buy Galactica enough time to make a jump and not risk it being destroyed before it could jump.
The Cylons as far as we know had fairly expendable resources by comparison, so probably would have prioritised finishing Galactica off even if it meant they lost all three basestars to Pegasus.