I don't know what advice SAM would offer, but casting notices go cold extremely fast, so in the interim -- here's my take.
Listing an agent is always better than not.
Not only does this give you immediate credibility, but most CD's will simply disregard headshots and resumes from unrepresented talent. In fact, unless submitted by an agent, your unsolicited materials will no doubt be headed directly for the trash. You should have Kaplan submit you if at all possible. Don't be shy about calling an agent directly to submit you for a specific role that you feel you're "right" for. Sometimes new talent gets largely overlooked, and they may even appreciate your initiative.
There have been many posts regarding Stanley's business acumen (or lack of it) on this board, but despite his many shortcomings, any representation is better than none. He's still managed to get lots of new talent their first bookings, in spite of his legendary idiosyncrasies.
In any case, if Disney does request you, believe me, Kaplan will contact you. Actors are the "meal tickets" for agents, without you they're of of business. At best, if you're called in and do well, who knows? You might go right to the top of the class!
P.S. - For security reasons, NEVER put your address on your resume. An email address or cell number is sufficient.
“Whatever works.”
www.robertkim.comhttp://www.imdb.com/name/nm0453647