The Steel fight could have hinted that he only temporarily copies powers. The steelplate on his chest went back into his body after he defeated Steel.
Well going by DDs looks you could say there're more DDs, Henshaws DD looks heavily different from Superboys.
But it's most likely just an artist thing.
__________________
“I once had an entire race killed just to listen to the rattling of their dried bones as I waded through them.” —Volrath
Can anyone answer this. Why does henshaw in mid fight comment about his artificial throat being dry and not being able to see well??? It is that magical defense thing?
So it looks like clones of Doomsday with each clone having the powers of one of the supermen? This is why i think (if i am not mistaken) they only displayed one power at a time.
So despite the powerhouse Booster Gold has become over the years, his direct attacks were still completely ineffectual against Doomsday. What makes that even more impressive on DD's part, is that he was not at full power. Woot.
__________________
"I am tired of Earth. These people.
I am tired of being caught in the tangle of their lives."