One Large and One Small
Skywarp and Thundercracker aren’t Starscream’s trine-mates and they quite resent the fact that it is thought that they are. You see, they never had a third, couldn’t find the right fit and they are rather happy with things being the way they are. Starscream, on the other hand, has a Trine, and quite enjoys the sensation, that and his high status in the eyes of Megatron, however, all this changes when both of Starscream’s Trine-mates die in-battle. Thinking he is doing the seeker a favor, he orders Thundercracker and Skywarp to take him into their Trine, thinking nothing of the fact. This blatant disregard of Seeker tradition leaves Starscream quite frazzled, and, in fact, opens his eyes to what’s really going on around him in the war.
Flash-forward to the building/creation of the Autobot/Decepticon Gestalts, and when Starscream finds that his Trine-mates aren’t quite as dead as he had previously thought…
This could go a few ways:
1) Autobot gestalt, Trine lures Starscream to the Autobot side
2) Autobot gestalt, Starscream lures the Trine-mates to the Decepticon side
3) Autobot gestalt, they leave the war altogether
4) Decepticon gestalt, Trine uses the bond to keep Starscream firmly on the Decepticon side,
5) Decepticon gestalt, succeed in killing Megatron, war is over in a matter of days
6) Some other way I haven’t thought about
Inter-gender breeding is banned; this could explain the attitudes of the hybrids, such as Powerglide (Mini/Seeker) or Tracks (Seeker/Mech) [Reflector (Gestalt/Mini)? Prowl/Bluestreak/Smokscreen (with a Seeker/Mech mating in their ancestry)? Megatron (Prime/Mech)?