Too risky to put Rezko on stand?

The Chicago Sun-Times reports:

Sources with knowledge of the government's case say prosecutors think Rezko is too risky to put on the stand. Rezko will only take the stand, they say, if the case takes a turn and prosecutors think his testimony is needed.

The sources say prosecutors fear Rezko brings with him much baggage of his own wrongdoing and that he'll "go off the reservation," in testimony. His presence as an Obama fund-raiser -- and onetime neighbor -- may also create a distraction, they say.

Most notably, however, Rezko has publicly disparaged the prosecution.

In 2008, Rezko wrote his then-trial judge, U.S. District Judge Amy St. Eve, to tell her he was being pressured to lie about Blagojevich and then-U.S. Sen. Barack Obama.

Tony Rezko sure got a great deal so far from the Feds. No one knows where he is and what "cooperation" has he provided?