Picture posting is enabled for all :)
I seem to remember reading from somewhere..years ago..that the last 'crop' of leaves should be left on plant to feed the crown too.. :-\But as comfrey is tough plant and I do find it hard to kill it..even if trying..I'm sure if you need you leaves it won't do any harm to it. You could still leave few leaves attached to it..just be safe side.. ;)
I dont see how that works