I can't hold your hand, John.
Watch every single throw of Watson and every throw of Jackson and tell me they are comparable.
You can't. Watson is a much more natural thrower, and though he lacks the raw power LJ has, Watson's touch, pocket presence, and even accuracy blow LJ out of the water.
LJ is a project with physical tools who is expectedly to ride the bench. Watson was ready to start day one. Do the math.