Training a started dog

Sounds like you have a good young prospect. If he has only been hunting 3 times, there is a good chance that more exposure to a few multiple hog hunts will help him tremendously. It is not unusual for a young dog to get over excited and become fixated on the first game they bay or tree. Matter of fact, it is a common problem with young hounds wanting to go back to trees in the coon hunting world. We just have to find his off switch and teach him to transition back to hunting after the catch.
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I would recommend petting him up real good immediately after pulling him off the hog. He has to learn that once the hog has been legged, this round is over and the hog now belongs to you as the pack leader. Take whatever corrective measures that you feel are appropriate to stop him from barking or biting the hog any longer AFTER the hog is legged. This behavior can have negative affects on your other dogs and screw a hunt up in a hurry. I wouldn't worry if he mills around for a while and doesn't go back to hunting immediately.You might consider putting him in the box with a no bark collar until the other dogs get another hog started. Maybe that will get his attention refocused and you can cut him into the race/bay. (After you remove the no bark, don't ask me how I know!)
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You might also try getting 2 hogs and putting together a couple of multiple hog mock hunts to help him along.
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As a rule, hounds are slower learners, more stubborn, and less intelligent overall than curs. That same singularity of purpose and dogged determination to finish what they start are also the traits that make hounds so productive once they learn what they are doing!
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Good luck. Worst case scenario you might have a good little "one hog dog"!