Last cycle, I got waitlisted with my 494 and 3.7 graduate GPA (from KCU's program). This cycle I retook the MCAT and got a 501 and I was accepted to the KC campus. Joplin may have a slightly less strict cutoff but I don't think anyone's gotten in to either campus with anything lower than 498 but they had a higher GPA to compensate. (Feel free to contradict me on the specifics)
I'd highly recommend retaking the MCAT and reapplying for next cycle in June.
According to the KCU-KC forum, there are currently 300+ people on the waitlist just to get an interview. As far as I know, all the interview spots have been taken and they're pretty much interviewing for the waitlist.
This last retake makes 5 times I've taken the MCAT. If this is your dream, don't give up. Do what you can to improve your application before the next cycle and retake the MCAT. If anyone understands how horrible it is, it's me. PM me if you want more details, etc.
Good luck! May the odds be ever in your favor.
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