You could argue Alabama or Ohio St pretty easily. In the end, Ohio St will have a chance catch up simply because their schedule is back loaded, and Alabama was front loaded.
Two things we must remember about the CFP vs traditional polls:
1) The CFP resets every week, whereas a team jumping another team without that team losing is rare in the traditional polls. Rankings don't matter at all until the last poll, and if not for ESPN these early rankings would not even exist until later.
2) At this point in time (though maybe not after Tuesday), Alabama and Ohio St are equal. 2 and 3 are equivalent in the final rankings. We must treat these early rankings as very relative at this point. They are nothing more than a snapshot at where the committee thinks teams are at through the present schedule.