Sebhat: 1:49.40, 3:44.85, 8:21.30, 24:10.20 (Oshkosh)
Campbell: 1:54.84, 3:44.74, 8:10.55, 24:31.30 (Oshkosh)
Esher: 1:52.31, 3:45.29, 8:21.96, 24:32.60 (Oshkosh)
Garcia: 1:54.89, 3:45.71, 8:37.07, 24:34.20 (Oshkosh)
Marquardt: 1:50.93, 3:43.24, 8:06.56, 24:45.80 (Oshkosh)
Not so sure about Sebhat being "not strong." The double makes it interesting, but if it's hot and gets tactical I wouldn't doubt his ability to run a 400m race, especially since the 1500m final is first.
800m is likely an event he entered to scrape up some points for the team competition.