Passing is strongly affected by height. That player has weak starting skills and low porential. You would be training him for emotional reasons not logical ones. If you do decide to go against logic and train him anyway at least he will train very fast and as an all-star you should be able to get all primaries up to tremendous which would make him useful to your team forever as long as you never bother with the secondaries. You cannot afford secondaries with his low potential.