yea, Shin Getter has a type of energy that actually make him do that, its called "Getter Rays", and he turns into Getter Emperor. it may be not as big as TTGL, but is far more powerful, the Getter itself is an unstoppable force destined to devour all universes until all Emperors from all universes fuse together with the Emperor Core. Size is not all, look at Mazinger ZERO, nowadays hes the strongest thing in the anime universe and is far smaller than Emperor.