It's a matter of stamina, if RJJ is able to keep things up for 12 rounds and keep boxing Tito he wins and has a chance to KO late if his stamina holds up, otherwise Tito does indeed have a chance to land something big.
Although this fight is stupid and proves nothing if it comes off, Jones looked just fine in his last two fights and took enough good shots in both for anyone with a half a brain to realize he isn't going to be knocked out every single time he sets foot in the ring; especially by a comparitively little guy like Tito Trinidad.