At the time the agreement was signed, AllGood Entertainment allocated up to 120 days for Dileo to get written confirmation from all of the Jackson family members, including Michael, and stated that if more time was needed to do so they'd have to subsequently discuss and agree upon it in writing. AllGood Entertainment was also called on to pay Dileo or his firm $2 million (or at least 10% of that) by December 31, 2008 "to secure the Jacksons in good faith" [the total they expected to pay the Jacksons for their commitment is $24 million. It is unclear whether such money ever exchanged hands.
So, first the created the plan and outlined the fees, expenses, and profits while signing contracts amongst themselves, and only afterwards did they seem to consider attempting to get written agreements from each of the Jackson family members, some of which expressed no interest in touring with the family (i.e., Michael). Seems a bit backwards to me.