Holly, if the police thoroughly investigate this person and don’t find Madeleine will you accept that or will you think they forgot to look for a hidden dungeon?
A thorough investigation and an overlooked hidden dungeon would not seem to go hand-in-hand.
I can't be certain the perp abducted MM to raise as his/her own. The motive may have been to carry out some assault and then dispose of but I think (and hope) it is the former. The other possibility is that the perp may have intended to raise as own but given all the media attention may have panicked and did something they did not intend to do. Another possibility is the perp abducted MM with some misguided idea about teaching the McCanns a lesson for leaving the children alone in an unlocked apartment and intended to return MM but again felt unable to do so given the media attention and may have done something they did not intend to do.
On a scale of 1 -10:
How sure am I my theory is correct : 9
How sure am I that I've identified perp(s) : 9
How sure am I about motive to raise as own at time of abduction : 8
How sure am I MM is alive and with perp(s) : 8