We've seen a few characters who aren't normally triple changers as triple changers... but why limit it to just existing molds. Cause all the ones we've see so far were repaints of other characters who are already triple changers. If we could remove that limitation we could have a lot more possibilities for different alt modes than well Optimus is a Truck and Octane is Truck so now Optimus is also a jet. With that being said you do still have to keep the vehicle mode they're most known for but you can pair it with any other alt mode you want as long as it's not a slightly different version of the same vehicle. Like Optimus can't be a big rig and a fire engine because those are both trucks and it's way too boring to transform from a truck into another truck.