Cadent does not equate to hidden, only the twelfth and six (and sometimes eighth) houses are "hidden", and this also depends in reference to which planet in reference to another. Inconjuncts between planets are 'hidden' relationships. Cadent mostly equates to weakness.
The ninth house though cadent is hardly a bad house, as the house of the sun god and the natural house of Jupiter, it is considered highly benefic. Mars as the ascendant ruler isn't placed too badly here, and you should have a natural interest in things abroad, foreign, religion or higher education, as well as the arts, astrology included.
The ascendant ruler Mars, and to a lesser extent Pluto are definitely indicators of your hidden potentials, Mars as the ruler of the fifth and in home of Mercury (term) your MC ruler, suggests lots of creative energy brought to ninth house related activities, as well as work and career; I think the influence of the ninth and tenth by primary significators the Sun and ascendant ruler are places where you can find great fulfillment and excercise potential, mostly in higher education.
Ray.