Rank? Depends on if the MOC ranks their slate. Many don't. Many simply give the academy a list of 10 names and says: "Choose One"
Can others on the slate of 10 get an appointment? Yes. Approximately half of the appointments are given out with the academy selecting one from each slate from the MOC. Plus, some from military related nominations like presidentials, ROTC, etc... That leaves around 600 appointments that still need to be filled. The remaining 9 from the slate of 10, who didn't get that "Choose 1" appointment; will all be placed in a National Pool. The academy will choose their remaining 600+/- appointments from this giant national pool.
Is it safe that because you received a nomination, that you'll get an appointment? No, not at all. In all truth, there will be approximately 6,000 individuals who receive nominations. The academy will only give out 1300+/- appointments. That means that 4000+ people with a nomination will NOT receive an appointment. (There's 453 representatives: 10 names each= 4530 nominees; 100 senators is 1000 nominees; approximately 500 presidential nominees; etc...) Many nominees will have more than one nomination, so the total of nominees may not be 6000. Let's say it's only 4000. That's still approximately 2700 who have nominations that don't receive an appointment.
best of luck, and congrats on the nomination. Believe it or not, that is a great accomplishment in itself. mike...