I looked at collegepolltracker.com, which analyzes the voters ballots and how they differ from the overall rankings. For each team that got any votes, they list how many voters gave that team their highest ranking, and how many gave them their lowest. If only 1 voter did so, that voter's name is listed. Sam McKewon's name appears 5 times as the only voter to give a team their highest or lowest ranking, the 2nd highest of any voter. They also analyzed each voter's overall ballot and how it differs from the overall rankings. Sam McKewon's ballot was listed as the 3rd "most extreme"-in other words, it differs from the overall rankings the 3rd most of any ballot.
Now, none of that means that he's necessarily wrong. But it does mean he's going out on a limb a lot more than just about every other voter. His preseason ballot is likely going to either make him look like a genius or an idiot.