For the purposes of the trial, James was a non mf'in factor, it seems.

Everything he said sounded like a lie. The DA, Tom Sneddon, investigated Michael in 93 and prosecuted him in 05. They only cared about the boys from the 93 era for possible abuse allegations made in the tabloids. Jordan Chandler, Macauly Caulkin, Brett Barnes, and Wade Robson. No one even mentioned James. So why would Michael beg him to testify? What would that prove?
Oh! Here's a random boy from the 80's who can vouch from me! 
If he wanted to do that for some dumb reason, he could have asked Emanuel Lewis, Corey Feldman, or somebody else who was more high-profile.
And it still doesn't make sense why you would want a man you had actually molested on the witness stand, especially when the prosecution didn't even mention him. Tf?