A large percentage of the players named either failed tests, sent checks to Radomski, were proven to have bought HGH from a shady clinic or were otherwise proven to have been involved with PEDs. There was at least one case where the investigators determined despite this type of evidence that the player could not be proved to have taken PEDs and he was not included.
There were a few where only testimony from a person the investigators believed along with other "hearsay" type testimony and along with sudden changes in physique and ability were used to name the players.
How does that become "largely hearsay"?
JMO, but Clemens will not sue.