Forgive my tinfoil, but I believe that the man is concerned that if the parents gain custody, she will thrive under their care and eventually reach the point where she might be able to tell what happened to her.
You are absolutely correct.
"I believe that the man is concerned that if the parents gain custody, she will thrive under their care and eventually reach the point where she might be able to tell what happened to her"
I agree completely! I've said this since first hearing of this case.
Pray for Terri.
DING! DING! DING! You win the prize! You are EXACTLY CORRECT!!!
The rest of the story is that if Terri IS able to tell what happened, her two-timing-father-of-two-bastard-children-possible-BOTCHED-ATTEMPTED-MURDERER-not-legally-qualified-guardian-husband Michael just might be facing the DEATH PENALTY himself!!!
Your theory seems to make more sense than what is going on right now - God Bless.