I imagine it was a scheduling conflict. Trust me, he did his damage at Colonies Zones with some sick swims.
Check out his results here:
www.patriotmasters.org/.../index.htm
Summary:
50 Free - 20.84 National Record
50 Back - 22.77 National Record
50 Fly - 22.61 National Record
100 Back - 48.49 National Record and the fastest 100 Back ever swam in Masters.
200 IM - 1:51.85 National Record
Summary:
50 Free - 20.84 National Record
50 Back - 22.77 National Record
50 Fly - 22.61 National Record
100 Back - 48.49 National Record and the fastest 100 Back ever swam in Masters.
200 IM - 1:51.85 National Record
Those are pretty good reasons to call it a season.