I'd say you're lucky and have a contented flock if you can't tell!
In my coops, if I stand facing the roost and it is against a wall, the one on my far left on the highest roost is the lead chicken. That spot is in a corner in both coops. I suspect the last one to roost among yours is at the bottom of the order. Sometimes you can see them jostle for the "lead" spot on the roost. Sometimes you can tell by who gets the treats first, and who tends to stay back and let the others eat -- unless it is a roo is being a good roo to his hens.
Those are the only tricks I've noticed, other than who pecks and who gets pecked. Not the most experienced chicken person here, though.