Was Trinidad's left hook really powerful?

it was hard.
even the ones he landed to jones body had a hard thud to them
They were powerful when he wrapped his hands himself :D
or was it more technique, timing, and accuracy?

It was all of them. It was his money shot and although there is always an element of doubt with the hand wrap allegations, it was still a fucking hard punch.
He had a beautiful left hook and left uppercut. The speed and timing were amazing and seemed to carry all of his 147-160 lbs into the punch.
negative on him carrying it up the ranks. He was a killer at the lower divisions, MW, not so much.