Ah, the memories of the 1996 Trials when ol' Bob Kempainen let it fly in the last miles...and still kicked a** on the incredibly difficult Charlotte course in cold weather. Still the stud of all time in my book as he worked full time and run sub 2:09/10 regulary. What a beast....
Kempainen was a beast, and especially impressed me with his third place at the 1992 trials after some serious injuries, but I don't recall that he ever broke 2::11 (excluding the extremely aided 1994 Boston race). I'm not sure why you think that he ran "2:09/10 regularly."