User blog comment:CalienteSnaidero/KF's Secret?/@comment-4473295-20120103180607/@comment-1038387-20120103191533

Nope. KF is slower not because he's younger, but because he got his powers by blowing up the garage with his chemistry set, while Barry carefully recreated Jay Garrick's accident under sterile laboratory conditions.

And as for the OP... just about everyone in the fear flashbacks said he had stuff they didn't want found out.