A full reading for Rooster × Leo meeting Rat × Capricorn is on the way. In the meantime, the score above is computed from the canonical element matrix and sign-cycle distance, and the profiles below cover each side individually.
Oh boy -- the Rooster/Leo is a manic-depressive cannonball of a personality, so everybody around you had better look out! Check in the mirror and see what kind of a day you're having -- it might not be advisable to walk out that door just yet. Your fits of moody misbehavior are what render you irresistible to your romantic opposite, as paradoxical as that may sound (to everyone but a Leo).
Power for its own sake, and the cold brutal solitary serenity that accompanies such an exalted position, are precisely what the Rat/Capricorn lives for. If they think they've seen goals-oriented people in action before, they haven't seen anything until they've seen the Rat in you breeze past them on your way to the top, in such a way as to make Genghis Khan seem mild-mannered, of whatever hierarchy to which you see fit to belong.