If u look up Hughes....
John Hughes Minor League Statistics & History | Baseball-Reference.com
And I run across this a lot when researching minor leaguers in the 70s...but, he was really young when his career was done. He was coming off two excellent power seasons ...
Today guys play as long as they can....but, makes you wonder why Hughes called it a career when he did
I do know he was not much of a defender so as a bat first guy perhaps the Phillies did not know what to do with him