I scanned quickly so I might have missed it, but in what way was he gelded improperly? According to my Equine Reproduction professor, who is one of the most recognized and respected in the country, if the testis and epididymis have been removed there is nothing left that would cause a horse to continue to act "studdy" as far as hormones go. If the horse continues to, it is simply a learned behavior that he learned before being gelded.
In other words, he'd need some behavior training, but it's known to be a bit difficult to work out.
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