I think it's great that you had an interview for SC, that means you have a chance at least of getting pull off the list. I think that if you're good enough to get interview at SC, then you must have a great stats and there shouldn't be a reason why Western wouldn't call you for their upcoming interview. Unless you're missing the 3 rec letters or anatomy, physio, and micro which are diff from SC requirements.
As for your invite for Worcester, you should do it. You'll be done in 3years( 2014) whereas if you wait another year and apply to W or SC, you'll grad in (2016). That's 2 years Difference and perhaps a loss of $ 200,000+ in potential earnings. It's just a suggestion though. Unless you're like ME and your whole life revolves around soCAL, then I don't know.