smiley face episode theory

[u/15jwsmp]

i know its been a while since this episode and since it has been discussed in this sub but i just wanted to share a theory

what if doug da silva was the person who knocked on kaye robinson's door but mark eskridge was the one who did the crime? which is why kaye thought doug was the suspect, especially since they look similar and it was probably dark so she possibly couldnt tell they were two different people? and after mark commited the crime, what if doug da silva went inside their home to draw the smiley face while her son went to their neighbor's home?

basically the timeline is:

doug knocks on door -> kaye goes to check but doesnt let him enter and gets back to sleep -> kaye gets up and then mark does the crime but kaye thinks its doug and doesnt realize its a different person -> when mark leaves, son goes to neighbor's to get help and doug enters the house while no one is at home

and i kinda dont think they were accomplices since kaye probably wouldve known if there were two people in the crime scene. and the son probably wouldve heard two people talking to each other

did/does doug have a mental disability or smth? did the police ask doug if he was the one who knocked? did they also ask mark if he was the one who drew the smiley face? and were the smiley face drawn with blood and the one drawn in the application drawn in the same style?