Actually that may not be the case. Legal eagles on Fox and elsewhere have been saying that just talking about extortion doesn't mean it actually occurred and due to newspaper leaks, the wiretaps had to be discontinued prematurely, before the talked about deals occurred. If Rezko actually has some evidence the feds can use against Blago, it would make sense to delay sentencing.
Yeah this is what I am thinking. Who is Rezko going to rat out? Blago is toast.
There are no other big fish up the food scale except (untouchable) Daley, Rahm, Jesse Jr. and O. O will get brought down before Daley ever does.
Unless Rezko rats out these 4 then who else would Fitz be interested in?