By some fluke, Starscream actually manages to defeat / kill Galvatron in their duel near the end of the series. Starscream now takes center stage, proving himself more powerful than Galvatron. How do you suppose the series would have continued on from then? Could Prime have defeated him like he did Galvatron?
If starscream got that powerful, Prime would never have defeated him alone. He wouldve needed help. Galvatron had to really dig deep into his reserves to beat Starscream. And Prime had to really power up to defeat Galvatron. Prime probably would have had to find an even more powerful power up. Or even have to merge with primus to beat the screamster. That really would of been cool if after the blackhole had been closed, Prime and Primus became one. The battle with Starscream would of been a multiple episode fight worthy of DragonBall Z. Primus/Prime would still need the energy of all the autobots to defeat him. Then everybody can live happily ever after with prime still part of primus.
They'd probably use Primus with the Ark to beat Starscream since Primus gave Screamer a good thrashing.
No, he would need some other power upgrade other than using Wing Saber or Leo Breaker. Something similar to when Prime combined with Omega Supreme in Energon, but with Primus.
Just add a battle helmut or mask to make the head more porportioned. Actually what i meant was it would be more of a metaphysical combination than a physiological one.