WI: Frederick the Wise marries Mary of Burgundy

What if Frederick the Wise marries Mary of Burgundy, what would be the implications of a Saxony-Burgundian union?
 
IOTL it was Mary herself, who finished the marriage negotiations. She chose someone, who could help defending her lands. It also helped, that Maximilian was a member of an Imperial dynasty. In other words Frederick the Wise seems rather unlikely.
 
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