I am not of the “hit man” theory...but a Dateline or similar show had a episode of spouses arranging meetings with alleged hit men who were undercover cops and there were several...all seemed bold and stupid but of course, we knew they were dealing with cops, they didn’t. So it is not out of the realm and would be harder to trace if the killer was otherwise a stranger, especially if a throwaway phone was used and cash came from a source other than known bank accounts. Though some “hits” have occurred for hundreds, rather than thousands of dollars.
The biggest factor of similarity for me in this case and that of Missy Bevers is that the perp is on video in both, yet there is uncertainty as to the sex of the shooter, in both cases the perp wearing unusual clothing and/or a disguise or costume.
It is shocking, imo, that both remain unsolved. I fear that unless someone close to the victims was involved, neither will be solved. Jmo