Upon literal deconstruction which I would in different circumstances avoid, could: is there a possibility...? Would: the question of will.
I for one find the difference between the two terms worlds apart, yes, in your own words. I believe that if you say yes to all those in the former and sometimes no to the latter, you'd find your light somewhere lurking around the corner.
Would I choose darkness? No.. Could I choose the light? Let's find out.