The 6-foot-2 cornerback committed to the Cyclones in September but took an Indiana visit with teammate Davi'on Riley in October without telling his coaches or Iowa State.
"It was stupid on his part," Shafer said with a sigh.
Since then, Brinson's status with the Cyclones has been in limbo. Recently, Cyclones defensive coordinator Wally Burnham called Shafer to let him know they were moving on.
"It sounds like they got a lot of JUCO guys recently and they'd have to wait to know," Shafer said. "What we're gonna have to do is open it up now. Dedric could join the class at the end but they don't want to over-sign.
"I'm starting to [call around] and let coaches know Dedric's available. It's too bad. He really likes Iowa State. They're gonna lose an awfully good defensive back."
The Cyclones currently have 21 committed prospects in the 2014 class, including two high school cornerbacks.
Lake Wales, which might have seven Division I players in 2015, remains in good standing with Iowa State.
"Wally's a good friend of mine, they've got to get who they've got to get," Shafer said. "They're in the Big 12. It's just one of those deals. Next year I'm loaded, so I know [Iowa State will call]."
Shafer mentioned UCF and USF as schools Brinson might wind up at.