without devolving into the usual conversation about the ncaa being the bad guy with its uneven rulings, i want to point out that what the ncaa does make clear is that the transfer is to sit out one full academic year, not one full athletic season. the specific term used is one "academic year in residence." more specifically, the transfer is to sit for one full academic year while at the new school unless there is a special ruling.
what potter did, however, was go through all of preseason camp at osu before deciding to transfer only days before the first game, which was midway through the fall semester. but potter didn't leave. he remained at osu taking classes until the culmination of the first semester in december. i'm not certain, but my guess is that his athletic scholarship covered 100% of his fall semester costs despite no longer being on the team.
again, we can debate about the ncaa's faults, players' attempts at claiming extenuating circumstances, and the questionable rulings all we want. the thing is, potter made it perfectly clear why he left, and it had nothing to do with anything other than playing time, playing roles, and (probably) starting spots. if you decide to transfer for those reasons, you are to spend one academic year (e.g., two semesters) at the new school before you can play. all of this is clearly spelled out. caveat emptor.