I have some more info that may explain things a bit more.
On 11/15, this particular coach posted the following in the Big 12 forum:
"Ok bluejayscott...My alma mater is only a C prestige right now....they won't always be, but Oklahoma St. is going into the grudge book...."
So apparently, Oklahoma St. also won a recruiting battle against this guy.
By pure coincidence, I am the prior coach at Oklahoma St. So this guy could well be suspicious over the fact that both myself, and my prior school each targeted recruits of his this time around.
There was never any contact between myself and Oklahoma State.
Should I preemptively contact CS to dispel any suspicions that may arise, or do nothing unless they contact me?