To prevent their destruction
Clay might have believed that Bryce was going to destroy the tapes if they reached him. Clay might have decided to skip Bryce’s turn to preserve the tapes.
Bryce was the main reason Hannah died
Bryce would have stopped their circulation
Even though Hannah made several tapes still it was very clear that Bryce was the main reason that motivated Hannah to commit suicide. Since Bryce’s reaction could have been unpredictable Clay chose to bypass him.
Bryce would have closed the case
Once Bryce realizes that he is being accused of killing Hannah he would have done every possible thing to close the case and escape from punishment. In addition to that his wealthy family could have helped him do it.
He might not have confessed
If Bryce was given the tapes then Clay might have not been able to let him confess his crime. Clay might have decided to bypass Bryce in order to get his confession. (See Why did Hannah Baker kill herself in 13 Reasons Why?)
To pay for his crimes
Clay wanted Bryce to pay for his crimes and he thought that the best way to do that is to not let him know about the tapes and instead record his confession on one of them.
He wouldn’t have changed
Clay might have believed that the tapes would have never affected Bryce in a positive way. Bryce doesn’t think he did anything wrong and so the tapes would have never helped him.
Clay wanted Mr. Porter to get them
Clay knew that Mr. Porter was responsible for Hannah’s death to a certain extent. He wanted to make sure that the tapes are going to rich him. He might have believed that Bryce would never pass them on. (See Why 13 Reasons Why TV is a good show?)
Why didn’t Bryce Walker get the tapes in 13 Reasons Why?
Did Bryce get the tapes in 13 Reasons Why? Why were the tapes not passed on to Bryce Walker?