I like to think the Knights were the Autobot equivalent of Seekers being ancient explorers. Knights of Cybertron without it being said. Since the Seekers used to work for the Primes looking for stars to harvest guess that makes them Star Seekers? Makes you wonder what sort of relationship Grimlock and his crew had with Jetfire and the other four Seekers. Maybe they were rivals? Or even enemies of each other. Being legendary of each of their sides.