Preston/Kody child support & David adopting Truely

When Kody/brown family were in the midst of the adoption of Robyn's kids- one of their biggest leverages was that Robyn would drop her pursuit of years of no child support if he allowed Kody to adopt the kids. Kody's big argument was that Robyn's baby daddy didn't put in any effort to see them & didn't pay to support them, so perfect Kody saw himself as Dad and they should just pretend the baby daddy doesn't exist.

All this to say- am I the only one who thinks Christine started this to lay the groundwork for David to adopt Truely? Kody's own argument could totally be used against him- he hasn't appeared to financially support or see his daughter, so the man who stepped up to the plate should adopt her according to Kody's logic. Do you think Christine would drop the child support lawsuit if Kody agreed to allow David to adopt Truely?