I think you have to listen to what Johnny said. Huck is a very agressive player, and probably would have bet those scare cards, if he didn't hit. But Johnny said that he read a monster hand in Huck's check.
I would have liked to have seen an ace or another jack on the river, to pay Huck back for trying to trap. Especially another jack. Then we would have seen how good Chan's read really was. With another ace, Chan has the nuts, but another jack would have left Huck with jacks over sixes, against jacks over aces. If Chan would have called that, that really would have been impressive.