Even if all the doors to the house were locked, this plainly does not prove that there was no intruder. Even the BPD (BORG) established that there were many copies of the house keys in distribution to friends etc. It really would be easy for a determined acquaintance paedophile to acquire copies, and then use them that night. No alarm and no dog. And the basement window and the grate would be irrelevant and not the point of access/escape. Also, the footprints in the snow myth is shot because the drives and paths were clear. So there is no way to say that an intruder could not have entered or that it was unlikely, surely?