I guess it wasn't Sistani that got Sadr off the hook on the murder charges the gov't wanted to pursue against him two years ago. I guess the hundreds of reports saying that Sadr's escape from those charges came about pursuant to a deal with Sistani weren't true, either. Damned media. I shouldn't believe anything they say about either Sistani or Sadr - I should just rely on what they tell me themselves.
I guess you read all that but failed to read that Sadr did kill Sistani's people and top aides. This was in the same media that you diligently read.
Sistani is not an Iranian puppet, Sadr is. As a matter of fact Sistani is well respected as an Iraqi and has a following in southwestern Iran.
You gotta brush up on your ME history :-)