Um... I think it's because of a surplus of the hidden agenda function being supplied mutually, plus a sense of same quadra understanding.
Gulenko calls the hidden agenda function the "launcher" function in Model G, iirc. He views the hidden agenda information as what is needed in the environment for someone to "recharge" most instantly and directly.
This effect of the "hidden agenda" over-energizing is part of why the person you receive benefit from in benefit relations gives you "benefit", and why it's named that. I mean think about it.