Do you have any evidence of this, or is it pure conjecture?
I am not a lawyer, but from my understanding a judge is required to appoint a guardian ad litem any time there is a potential conflict between a guardian's own interests and those of his ward. Decisions may only be allowed without a guardian ad litem if there is no plausible conflict of interest involved.
I don't know exactly what the statutes requiring a guardian ad litem say about what happens if a judge fails to appoint one when legally required, but I believe it would open up to question any decisions made by the judge when a guardian ad litem should have been present but was not. Had Judge Greer found a guardian ad litem who would rubberstamp anything Schiavo wanted, his approval of Schiavo's disbursement of over $300K to Felos would have been beyond question. But since he didn't do that, I believe any findings of fact made in relation to the trust fund would be open to investigation in an independent audit.
To be sure, I don't know whether an indendent audit would actually manage to land the Schiavo Triumvirate in jail. I suspect strongly, however, that they don't want anyone else looking over their books.