Creating an omnivorous design spirit was just the basis of creating the most spiritual incarnation for himself.
Ves did not pursue power for its own end. That was useless and counterproductive.
"Vulcan is just a means to an end. I should always remind myself that my main identity is a human and that my main profession is a mech designer. If whatever I'm doing is not conducive to my mech design ambitions, then I should just forget about messing with this stuff!"
If Ves wanted to obtain a sustainable source of spiritual power, then he could already rely on Blinky for the most part.
At best, Vulcan could serve as a reliable and loyal source of input for the spiritual cat if his other design spirits were unwilling or unable to donate their reserves.
What truly mattered to Ves was how Vulcan could augment his mech design capabilities!