There were other two legged dinosaurs that T-Rex had to beat.
The general body plan was established by evolution, it worked.
This is what worked at that time.
The T-Rex species was in that mold.
To become the top predator, with access to all the prey animals
it came into head to head competition with similar dinosaurs.
To win, it had to be better than the others.
Weather in a direct battle or by out competing them, T-Rex won out to take over the top predator niche.
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