I'm pretty sure that the Texas non-conference game puts Ohio State at #1, even though Indiana has the best win, at Oregon; the fact that Indiana has three weak nonconference games will put them at #2 for now. For this reason I actually wouldn't be surprised if Texas A&M is 2 and Indiana is 3.
And yeah I'd actually be really surprised if Indiana wasn't #1. They obviously belong there, and name recognition is the only thing keeping Ohio State there in the AP.