The 5C didn't have the secure enclave that the 5S and later has. It was introduced in the A7 chip. The 5C had the A6. The 5C was a rehashed iPhone 5, not 5S.
Read above.
I understand that. What I am looking at is not the 5S. I'm looking at the statement about a "narrow band" of iPhones. I am sure LEO's all over have a backlog of 5C, 5, 4S, 4, etc... all locked up and awaiting help.
That statement by the FBI made no sense to me.