It would not be the first time a man dressed as a female before or after a crime to escape.
The simple truth though is that given the hour of the murders the chance of being seen would be slim. Peopel do not look outside their windows at that hour, they are in bed sleeping. Those few peopel on the road are unlikely to be able to recognize anyone on a bike or in a vehicle even because it is dark. You see car headlights approaching you or talights in front of you not who is driving.
Unless you are making a ton of noise people do not get out of bed to investigate a car, especially one simply passing by. One of my neighbors (5 houses away not right next door) had a daughter who was a few years older than me. She had a wild party. My friends and I were kicked out when we tried to go in so we heckled them all night. One of the partiers road all over the lawn across the street from her house. He really tore it up. Amazingly the people did not wake up. They had no idea who did it we had to tell them. We only knew the person because it was someone we hated. If he was a stranger we could only have given a vague description of the car.
You can get a way with a lot at night which is why that is when kids go bashing mailboxes and vandalizing cars. A whole block of mailboxes smashed or car windows broken and nobody finds out till morning when they are long gone.
Another crackpot idea that scipio believes in.

All this is just shear speculation. No one but no one can place Jeremy at the scene of the murder. They are either those who have something to gain and who took careful steps to secure their inheritance immediately after the murders.
Those who were so mad at him that they were prepared to put a cushion over his head to in order to kill him. Or those who dream up pathetic stories like this one that only the gullible would believe.
But in reality there is no forensic evidence to place Jeremy at the scene and only the word of a proven liar whose words and testimony cannot be verified by any neutral party.
Yerv got nothin mates nothin at all. Only your pathetic tiny prjudicial minds.
As for Colin Caffell his mind was well and truly washed and prepared and played upon by the relatives at that time when he was very vulnerable.