Jus' for grins....
I'll go on the record that LE is considering charges for Lee withholding information and/or falsifying statements regarding his knowledge of Caylee's whereabouts prior to 6/15. Without quoting him in his statement he indicated the last time he saw Caylee was @/on Cindy's bday ~6/5, IIRC, and that Caylee was with Casey who had been "M.I.A. [missing in action] for weeks".
On the Sticky thread "6/10-6/14) I posted a chi-square analysis of Casey's pings 6/3-6/6 8PM-8AM vs. 6/10-6/13 8PM-8AM. During the first period Casey was established to be @ G&C's. During the second period Casey & Caylee were reportedly not @ G&C's.
This analysis showed with a 99.99% confidence interval that, when comparing the 6/10 period to the 6/3 period, the origin of the cell traffic during the 6/10 period was from a more northeastern location....i.e. Lee's house.
IMHO, Lee allowed Casey to use his house when he was either there, and/or traveling to Chicago working a business deal there, and Casey kept Caylee there vs. Tony's apt.
Since this occurred prior to the likely date & time of death, LE maybe waiting to see if/how much other evidence links Lee to the crime. It would be counterproductive for the SA to go after Lee if they didn't have enough evidence putting him in the middle of the crime...IMHO it would tend to distract/weaken their case against Casey...making them look desperate/uncertain and opening the door for Casey & Lee to point finger @ each other and screw w/ the jury....all, IMHO.