If the Juburi surrendered it would not mean that the whole of Tikrit would follow suit, but it would be an interesting indicator of deep anxiety and an unwillingness to fight coming from a fairly powerful social component of the city. The move would also be in line with the general mood in this area, which theoretically should be populated by pro-Saddam supporters.
We're just a few miles away from the home of Ali Hassan al-Majid, a.k.a. 'Chemical Ali,' the Saddam confidant who was killed in Basra a few weeks ago. The villages around here are peopled by tribes that have close ties to the Saddam regime, but nearly all of them seem to be sending out word to the Peshmerga that they want to talk not fight.