Sure, but aggressors are also pretty good on their own without any leaders which is kinda my point.
i have rarely ever been let down by my aggressors in 8th 9th or 10th, they’re almost always one of my best performing units.
my point is that if a unit is fairly costly but not particularly good, it is still not good if you have to continuously invest points in the forms of leaders and possibly enhancements and CP for stratagems to make them good.