It really doesn't matter anyway. Once the scoring model changes, then that card won't count.
DW was in a similar boat. I mentioned this a couple times before, but DW's dad had a Citi card with her as an AU. The card was basically maxed at $6000 on a $6300 CL. Her utilization could never be less than 95% because of that. However, the card was 6 or so years older than her oldest card.
So, we disputed via each CRA and it was deleted. Scores dropped I think around 10 pts avg. Darn it. To rub salt in the wound, dad-in-law paid off all of his CCs the following month.
The card is easy to remove. I don't know if that is different if there are baddies on it or not.