He went through due-process, which means he has lost many of his rights.
This is just another delay tactic.
It took him (his lawyers) 15 years to come up with this excuse.
Attorneys contracted to do defense work are way underpaid. The quality is horrible.
You think the prosecutor is going to tell the defense that they were paying some of the inmate witnesses or giving them other favors, even if they are required to do so?