I haven't talked to others directly about letting him go, since that doesn't seem appropriate or fair. I do know though that people have had to wait on him for things longer than they should, and follow up with him more than should be necessary. So while he does have useful knowledge and insights, I feel like he may be holding others back as much as helping them.

I'm not sure that (essentially) the threat of firing would be the best motivating measure. If I've made the decision it seems more fair to just do it (along with a good severance).