My understanding is if you were to pursue the Primary Care Scholar Program at LECOM, you're limiting yourself to the residency programs affliated with LECOM OPTI (however, I'm not certain that you are 100% commited to LECOM's OPTI for residency). I'm pretty sure than an ACGME residency is out of the question. When it comes time for fellowship, the competitive ACGME fellowships (cardiology, gastroenterology, heme/onc) is out of the question since you won't be eligible for the ABIM board or ABIM subspecialty board (and AOA residencies are not usually associated with strong university programs, which you will need if you are interested in ACGME competitive fellowships). You can probably pursue the few cardiology/GI/heme-onc AOA spots, but you will be OUT of residency for a few years before you even become eligible for fellowship (per your contract with LECOM, unless you want to pay that 4th year tuition). You will be competiting with current residents with face-to-face time with fellowship directors (and faculty attendings).
"The pathway curriculum is directly linked to primary care residency programs in Lake Eries Osteopathic Postgraduate Training Institute and to other osteopathic primary care residency programs nationwide."
-Shannon, Ferretti, et al. The Challenges Of Primary Care And Innovative Responses In Osteopathic Education. Health Aff May 2010 vol. 29 no. 5 1015-1022