You are right - and there has been a lot of speculation about the housekeeper and Fleet White on that very point -- but no one has come forward and said the handwriting was a match to either.<quoted text>
Think about this...If the murder and set up was premeditated by someone who had access to the house in the days preceding the murder, he/she could have taken the pen and paper and composed the ransom note offsite and returned with it on the night of the murder.
The handwriting --- it may be possible to disguise a short note - a few lines - but not three pages -- not using a felt tip pen that would bleed it you went slowly.
Experiment -- copy three pages of this thread - or your favorite poems - or words to songs you know well. The only letters you need to change are the VOWELS -- replace each vowel with a star. See how far you get before you write a vowel.
That puts it into perspective -- how can anyone hope to disguise their writing for 3 pages??? Would anyone really think they could get away with that?
I think the killer wasn't so close he thought the family would know his hand. He's someone a bit further away. Like the roofer in the Elizabeth Smart case - or the neighbor in Florida ...