I haven't looked into the B1G tiebreaker scenarios because, quite frankly, I don't care enough to bother. I would guess that Oregon with 1 conference loss would be ahead of Michigan with 1 conference loss based on Oregon beating USC while Michigan lost to them.
If Michigan beats OSU, Indiana beats Purdue, and Oregon beats Washington:
it's Indiana vs Oregon again (Oregon gets it over common conference opponent winning percentage; it can't just be broken by results against common opponents because OSU is still there as a 1-loss team and since the 3 teams didn't all play each other the only common opponents that all 3 played are Washington - who all 3 beat - and Wisconsin - who all three also beat).
If Michigan beats OSU, Indiana beats Purdue, and Washington beats Oregon:
it's Indiana vs Michigan (Michigan would get the tiebreaker over OSU for having beat them).
If Michigan beats OSU, Purdue beats Indiana, and Oregon beats Washington:
it's Oregon vs Michigan (essentially Oregon wins a 4-team common conference opponent winning percentage over Michigan, Indiana, and OSU; then Michigan and OSU would edge out Indiana based on records against the shared 2 common opponents - Nebraska and Purdue, and finally Michigan would get the final tiebreaker over OSU for having beat them).
If Michigan beats OSU, Purdue beats Indiana, and Washington beats Oregon:
it's Ohio State vs Michigan again (Michigan and OSU would edge out Indiana based on records against the shared 2 common opponents - Nebraska and Purdue, and every executive in charge of FOX Sports would collectively all cream their business suits).
If OSU beats Michigan, Purdue beats Indiana, and Oregon beats Washington:
it's Ohio State vs Indiana (Indiana gets in over Oregon for having beaten them)
And of course...if OSU beats Michigan and Indiana beats Purdue:
it's Ohio State vs Indiana