I find the specific analogy of Trinity/obedience disconcerting. Maybe it's just beyond me. But I think I get the concept. I would call the "obedience" of the Three more as "in sync" - utter mutuality of understanding of source, objective and process and erupting in synco-patious concensus judgment. 
I also like the "lamentation" but would suggest it more like the "groaning" of  birthing, seedling emerging, the leg pains of an adolescent, all expressed in different ways from the "joy"/pain of birth, evolution, to the suffering in poverty, injustice, illness, anger, angst, despair....  
And I get it that Jesus was not "obedient" in the sense of doing what he was told, or fulfilling an agreement/mission that he wished he hadn't entered into.  It was the obedience of ineffible discernment, a sort of consultation among the Three wherein Jesus the man was fully in scyn with/as the Christ but as Jesus the man confronting the lamentation of such pain.
Trying to grasp God is sorta challenging.