I'm not sure there is truly a path for Bucky to make the playoffs anymore. If they beat PSU and Clemson AND Washington both lose then you're talking about Michigan moving back into the playoffs and I just don't think the committee will put 3 B1G teams in a 4 team playoff...especially when the Pac12 winner (in this scenario Colorado) is also a top 10 team with 2 losses. If Oklahoma (also 2 losses) won convincingly over OK St., becoming the Big 12 champ, then I believe they would also be in the playoff conversation in this scenario. Wisconsin has a legit case being the #6 team, the B1G champ (in this scenario), and their only losses coming to OSU and UMich, but again I don't think the committee will put 3 B1G teams in there.
If either Clemson or Washington lose while Bucky wins convincingly, then the committee should move Wisconsin in to the playoff over Michigan. I'm not sure that happens though.