How much time do you actually spend with this guy? Measure it. Don't guess, or you'll be wrong. Verify that you can get cheaper or better work elsewhere BEFORE

How much time do you actually spend with this guy? Measure it. Don't guess, or you'll be wrong. Verify that you can get cheaper or better work elsewhere BEFORE you let this guy go. Ultimately you need to know if moving onto better talent is a good ROI. Training is always an option, no-one is born great, and there are costs associated with changing staff.