When "they" "painted" the shadow in, "they" missed the head of whoever "they" were trying to hide.
So we're agreed that it is indeed a head? Excellent!
Ask yourself: How many people-------in the first five-and-a-half decades following the assassination--------actually noticed that there was a man standing right behind Mr Lovelady?
Not a single one. So if hiding the presence of that second man was the objective, it was handsomely achieved!
This was, in short, a cover-up perpetrated in and for the age of analog. It has failed to withstand the unforeseen scrutiny of a digital age.