The court heard Gedel said in his evidence that Dodsworth had given him the makeshift knife, a claim Dodsworth denies.
Storey said Gedel described Dodsworth as “resourceful” and “someone who could obtain things for you”.
The prosecutor told jurors that CCTV of Gedel handing Dodsworth the knife after the attack shows him walking towards Gedel as if he “knew what he was doing”.
He said this contradicted Dodsworth’s claim that he was surprised by Gedel and tried to hand the knife back to him.
Peter Moulson KC, defending Gedel, said Watkins was still on his feet when he had left the cell, adding: “If you were dead set on wanting to kill, wouldn’t you make sure you had done?”
Moulson added: “Is there evidence he just wanted to cause some harm, not serious bodily harm?”
Judge Mr Justice Hilliard told the jury there was no dispute that Gedel was guilty of at least manslaughter.
It was agreed that a “deliberate, unlawfully inflicted injury caused Ian Watkins’ death”.
The trial continues.