So everyone started out as prospective pods and ended up leaving to become an MD or DO (or PA in the case of that one person)?
No, the BMS program grants a MS in biomedical sciences. It's a totally different program than podiatry - although you do sit side by side in some classes. The BMS is a SPM (special Masters program)...
http://forums.studentdoctor.net/showthread.php?t=346106 (FAQ on SMPs)
Most of the people in the Barry BMS program are pre-med, -dent, -pharm, -pod, etc. It's a good program to do if you have a good MCAT but borderline gpa. It's typically undertaken by people who were rejected or waitlisted at their grad program(s) of choice and are looking to beef up their future applications. Some BMS students also retake the MCAT during or after they do the MS program. I hung out with a few BMS students while I was in basic sciences, and as gasolino said, many of them do get into MD, DO, DDS, etc programs after they do well in the MS. Especially for those who complete the 1yr BMS track with good grades, it shows professional programs they may apply to afterwards that they can handle a rigorous grad level science curriculum.
The students doing the 1yr BMS have basically the same curriculum as the 1st year pod students... same gross anat, biochem, histo lecture, neuroanat, etc. The BMS just have a different stats course, a bit more watered down histo lab and physio lecture, and they take nutrition and ethics instead of LEA. Due to the many similarities in curriculum, Barry then lets their pod students who have passed the basic sciences with no more than 2 "C" grades and have a BA or BS take the MS comp exam for $25 (re-take is $125 if I remember right). If you pass the comp, you get the degree.
I'm not sure if other pod schools have that MS degree option or something similar. I don't think Ohio would since they are a stand alone pod program; I'm not sure if they are allowed/accredited to grant degrees aside from the DPM. Scholl, DMU, AZ, or Temple have major university affiliation and dual degree offerings, so they may offer something like the Barry MS option... you'd have to contact the programs and ask.