Wow, just looked it up. Never thought it could be like this
Of course the difference is not that big, but still. Well, you learn something new everyday
Actually I believe height doesn't influence passing training. The correlation with height might very well be a spurious correlation. Taller guys generally have lower passing skill compared to the other skills and therefor have a bigger elastic effect.
My theory is that the effect we see is actually from the elastic effect (which will really work here) instead of height.
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For this particular player I agree with Westri's advice. If however you really want to train him without playing him too much out of position you could do a bit of 1-on-1 training from the forward spots. And then maybe later 2 or 3 weeks of passing training during the offseason. But that is only if your really are attached to this guy because he is your original trainee or something.
Crunchy! If you eat fast enough