Not likely, the "cycle ninjas" had long hair at several points during the season, visible beneath the helmets. There was always four of them, so I get why people may be thinking the snowmobiles were the Gemstones but that doesn't make sense practically.I expected the Lissons to be behind it all.
I did not expect Lyle and his crew to be just as bad of bumbling dumbfuck idiots as Jesse and his crew. Hilarious.
PS: Was it Amber with the rifle at the end? The hair...
They're selfish and spoiled but they're not cold blooded executioners- Martin hired the cyclists, likely with Eli's knowledge to some degree.