Squeeze play, Iraqi-style: Moderate cleric putting squeeze on radical Sadr?

Austin Bay writes about Iraq's leading Shia cleric, Grand Ayatollah Al-Sayid Ali al-Husseini al-Sistani possibly putting the political squeeze on Iraq's Shia radical Muqtada al Sadr at TCSDAILY,

Outsiders - including U.S. government officials - can bewail the Iraqi parliament's lack of progress in forming a government, but since the middle of March I strongly suspect the hidden story has been the Interior Ministry and the Iraqi nationalists' war on Sadr. It's a quiet police and political war waged with the blessing of Ayatollah Sistani. Creating a strong and stable Iraqi government (the so-called "national rescue front") is the goal. Sistani has advised Shia leaders to make concessions to Sunnis in order to establish a "unity government." That's an action anathema to Sadr.

Has Sistani's python begun its final squeeze?