For one, you're the guy who has actually gotten into Pitt, so that's an automatic point in your column! Congrats on that--hopefully I can join you there. 🙂
As for being involved in research for a while, I'm not sure that will have a direct impact in terms of skillset, and so I'm not sure how much inherent benefit it has for the program. I mean, how much will my experience with basic science methodology at the bench translate to clinical research? I'm guessing not very much. Additionally, if I choose to apply to CSTP, I will likely want to focus on immunotherapy rather than the neuroscience that I've been working in throughout my undergrad years, so any familiarity with past research topics will not be an advantage. I'd be pretty green in that environment, I think.
So I think you should go ahead and apply. I doubt you will be as disadvantaged as you perceive--they obviously liked you as a medical applicant. And should we not get accepted to the program, I have no doubt that we can pursue clinical research as the scholarly component--this is Pitt after all, with no shortage of research opportunity. Hell, we can probably even attend the same special lecture series as the CSTP members if we sneak in the back row. 😉