My guess is that Terri's long range plan was to collect Kaine's life insurance or perhaps an inheritance/trust fund upon his death. In order to make herself and her (and Kaine's) daughter the sole beneficiaries, she needed to get Kyron out of the way first. Perhaps her initial inquiries regarding a 'hit' on Kaine were part of an earlier (now revised) plan that changed when she saw the benefit of getting rid of Kyron first and then Kaine at a later date. More likely, IMHO, her plan all along involved the separate deaths/dissappearances of both Kyron and Kaine. Kyron would be eliminated first, with the 'hit' on Kaine become operational at some pre-determined later point in time. Additionally, I'd speculate that her plan my have been to stage a scenerio where it would appear that Kyron wanders from school, but then perishes due to exposure or drowning, thus without raising the specter of any criminal element. Perhaps she successfully removed Kyron from the school without being seen, but was unsuccessful at setting up the scene of his 'natural' death. If LE are also considering this a possible scenario, then they may believe Kyron was being kept alive until his accidental/natural demise could be staged, hence Desiree and Kaine's recent change in tone regarding Kyron's status as live or dead. With the new info from LE (according to the above scenario) Kyron's parents probably believe there is an improved (although still slim) chance he's still alive.
