Not all the fragments were collected or able to be reunited (which is why Prowl had to sacrifice himself). Presumably, Starscream was killed because he flew within range. The other clones (as well as Wreck-Gar and the Constructicons) are unknown as to whether they are alive or dead, but presumably they may still be alive. All the Starscream clones are still alive. Sunstorm and Ramjet are in the custody of the Autobots (Decepticon Air), Skywarp and Thundercracker are somewhere in outer space( Transwarped), and Slipstream has not been seen since she left Earth (Endgame, Part 1).