The only defense worse than Ohio States (except against Michigan some how) is Oklahoma. Oklahoma has the worst ranked defense in all of Division 1 over the past 4 weeks. Oklahoma doesn't pass the eye test.
I'm not sure Oklahoma will win against Texas.
On the road at Purdue is just like any other power conference on the road, anyone can beat anyone on a given day. 1 bad loss has gotten into the playoffs before.
It would be better for Ohio States program to go to the Rose Bowl and not the playoffs.