The enemy warships were getting felled in greater numbers.
After the Rubarthan commanders and champions chose to go for the second plan, they shifted their emphasis to destroying the warships, which served as the foundation of the enemy force composition.
The native aliens could not rely on phasefighters alone to win any battles. The alien strike craft simply did not play an important enough role to merit greater expectations.
The alien phase whale and phase lords may have been able to press the assault and dismantle the entire orbital defense network by themselves.
However, they could only accomplish this goal by disregarding their own health and safety. If they valued duty above their own selfish interests, then they might be able to brave death and allow for at least three-quarters of their numbers or more to lay down their lives to conquer Kayana VIII-E.
As if.