Quan

If you have an Oscar and Shigure you could do both.

If you can I would suggest waiting to see if he is gets the demotion. As that may make the decision easier.

I agree with the guy above me, if he gets demoted you can fodder him freely. But the skills aren't good enough to throw away to give up a 5* exclusive.

If you fodder him off, it's most likely for his assist.
Put that on a unit in a team with a bladetome user.