An excellent case – really two in one: Red John and Renfro.
Dinelli's threat to fire Patrick is completely stupid – the entire reason Patrick's there is to solve his family's murder. Not letting him work the Red John case will just push him away. Dinelli does what he always does – he backs his team. He is a good man.
The Red John link turns out to be legit – if Red John hadn't made his presence known, they might never have had confirmation that Renfro really had proof. Red John wants Renfro dead. Given that Patrick got Renfro out of jail, not following through on his part of the deal is exceptionally ungrateful.
We now know two important things about Red John – he's a genius and he's an excellent hacker.
"It's my name." "You should have lied, as you so often do!"