There are many reasons I think this was a "hit" - not the least of which is the manner in which the girls were killed.
The killer would NOT necessarily have have come on a bike - because that would ID him as a "biker" - and immediately alert the family and OSBI to the Bandidos connection.
We don't know that the killer didn't come on a bike, just that the POI didn't. Plus, the killer or POI may NOT be a biker, he may just be an "associate".
The Bandidos have been bad news for a long long time, they are not a "nice" bunch of people and are into criminal commerce, drugs, guns, theft, prostitution etc. They are an old style "biker gang" - they were around when I was in High School.
I think the connection is pretty clear here, at least some of the Placker family was somehow connected to the Bandidos. If any one of the family did ANYTHING to really P-off those guys this very definitely could have been the result. The Plackers do not have to be bad people or involved - NOTHING they did could have warranted the killing of two innocent girls. The OSBI did clear the family (meaning NONE of them KILLED the girls) but that does NOT mean that someone else didn't kill the girls to HURT the family and send them a message. The family can hardly change who they are or who they may know (or have known) or who their kids got involved with that were bad news. NONE of that makes the Placker family at fault in this murder - BUT it could be the MOTIVE for someone to kill these girls 300 yards from home execution style.
IMO the ONLY reason for someone to take so much time, and use TWO guns and end the act with two carefully placed execution style shots - after the girls were probably already dead, was to send a message to SOMEONE. A retaliation, a pay back, a shut-up, a vendetta - the killing was, IMO, a MESSAGE to someone.
And it is borne out by the absence of the families in the media, the way Taylor's funeral was handled, the fact that there was NOT ONE SINGLE "family" photo in her memorial video or anywhere - every photo of Taylor shown was taken at school and her family (GP's even) are nowhere to be seen. Not ONE PHOTO shown of Taylor and her siblings, her GP's or ANY FAMILY! There is also the way even the POI information was released. It just appears the Placker family is hiding from something (or someone) for a reason. Not because they are guilty, but because they are (justifiably) scared that the crazy who killed the girls will strike again. The killer has already shown he doesn't care WHO he kills, so long as he completes his "job".
To me, there are so many things here that add up to the Bandidos and a "hit".
My Opinion