Cason ran 9.99 in Sept 91, then broke the 60m WIR twice : 6.49 (heat) and 6.45 (final, WIR) for his season debut in late January 92 and again in 6.41 in Feb 92, was the fav for '92 Olympic Trials (ran 9.88w and 10.08 into -1.2 in May) but injured his Achilles a few days before the heats. He stopped his season and moved to Seagrave. In 1993, he ran 6.56 indoors and 9.79w at Trials and 9.92 at WC in August. In 1994, 6.58i/9.98, in 1995 6.60i/10.23, in 1996 no indoors and 10.07 and injured at Olympic Trials. How long did he was coached by Seagrave i don’t know.