Add this:
Jacksonville 2006:
In the lost and found:
http://www2.brightroom.com/11293/browse/lost
Top left picture from the start (>2 min lag). Hat, bandana, long gray shirt, number covered, Boston marathon distinctive shorts.
Contrast with the finishing pix which are the only ones for his number (no mid-race ones, unlike the guy who got second in the age group) : White shirt, same shorts, different hat, mirrored glasses.
http://www2.brightroom.com/11293/198
Men 45 - 49
198 20 1 Kip Litton, 45, Clarkston, MI 1:26:49 2:58:08 3:00:11 6:53
316 26 2 Ed Reid, 47, Bradenton, FL 1:29:30 3:02:05 3:02:07 6:57
552 28 3 Rex Noble, 46, Palm City, FL 1:30:16 3:02:23 3:02:30 6:58
47 29 4 Tom Louderback, 45, Jacksonville, FL 1:25:46 3:02:16 3:02:38 6:58
1043 71 5 Brian Copeland, 49, Ft Lauderdale, FL 1:37:40 3:15:55 3:16:45 7:31
If you desired you could cut the Jax course quite easily at several spots. It is very spread out in the sub 3 range of runners. The splits would indicate a 1:24 half split. This was 2006 - compare to 5Ks etc...