I agree,besides the inquisition is more likely to thrive if we invest an equal amount of resources to each faction.Let's just hope it doesn't affect our pc's relationship with Cullen,I'd hate to loose content,just because I don't feel like conquering every single keep in Thedas.
I actually wouldn't think Cullen would want to just throw all the Inquisition's resources into conquering every keep in Thedas. That would be pretty poor military strategy, to take a bunch of keeps without considering how you're going to supply them and without any way to gather intelligence about potential threats.
It would make a lot more sense for the advisers to work together than be adversarial. They might disagree about resource allocation at times, but on a basic level they would all be in a better position to achieve their respective goals if they had some support from the other pillars.
If Cullen is doing his job right, he shouldn't just be pressing for constant military action, because there's more to having a strong military force than just fighting battles. I think Cullen is smart enough to know this, and diplomatic enough to realize he should try to get along with the other advisers. I think he'd agree in principle that resources need to be divided between the three areas in some manner, not given exclusively to his own.