Actually he can, Hopkins was a WBA champ when he signed DLH and he defended his title against mandatory Allen, with his fight signed against Oscar. There are plenty of precedents for that
And, ofcourse, the proof
http://boxrec.com/media/index.php?title=Fight:728683
And, ofcourse, the proof
http://boxrec.com/media/index.php?title=Fight:728683
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