However, IF Rove lied to a grand jury and IF Cooper's notes proved that Rove lied to a grand jury....WHY did Rove sign a release to allow Cooper to testify before the grand jury?

What possible reason would Rove have had to sign a release that allowed to Cooper to implicate him...unless Rove believed that Cooper's information proved he was innocent?

As noted before, there are still too many unanswered questions here to keep claiming that Rove committed "treason."