If Feldman knew Westerfield was guilty, then what evidence exists that Feldman could present that shows Westefield's innocence?
...to question the reliability of prosecution evidence and to present alternative theories, explanations, etc. of the evidence.
Questioning the reliability of evidence is one thing. Concocting alternative theories is nothing more than playing "what-if" scenarios with the jury. He would really be asking, "What if my client didn't kill the girl? Would it then be possible if...?" If he knew the client to be guilty, then there is no evidence that proves otherwise, because he knew otherwise. He would be falsifying evidence to present false assumptions as possibilities, and he would be doing it with the intent to deceive.
-PJ
Show us the money, with a detective's name signed to it -- that a proposal brought by Feldman to detectives contained such information. Before that, it is so much unfounded insinuation.