What persuades you to drop a trooper?

[Shifter]

I don't normally request troopers, but have occasionally. I normally keep all my troopers until I get a request, I then look for the highest inactive and drop them. If I don't have an inactive , 7 days, the request is ignored.
My exception is if the person's 100 5* champion is stripped of talismans or low level talismans they are gone. It's your champion make him grand.