I am curious about the harp thing as well....sounds like you have some special info about it...
could it be...and this is just a guess...that Ed left the garage door open purposely so someone could come in and steal the harp?..perhaps, there was a big insurance policy on it and perhaps Ed needed money????.....is that possible?
what if it turned out that Ed arranged with Ricci to steal the harp, but Ricci being the crook he is also wandered into the rest of the house, saw Lizzie, talked with her, and thought he had to take her to protect himself....a real bungled burglary for sure....
that scenario would certainly explain both Ed's and Tom's ridiculous statements to LE ....especially the words of Tom that said...."its over the boundaries" as in, taking Liz was not in the deal....
okay...just random thoughts....but since we have no Liz, any ideas are still open for discussion...