Many big name drummers have been replaced in the studio because they didn't do their homework.
They would try and record a few tracks but it was obvious they didn't get themselves 3 months practicing on a daily basis for the job so they got replaced by session drummers. Even if the feel is not the same, at least the result is listenable.
A good song is based on a great drum performance, be it simple or technical. There's no way around it. If the drummer can't do the job, you will end up over editing, quantizing and sucking the life out of it. And, IMO, it's more important feel and control than timing and hitting hard. Many pros agree they prefer a drummer that is not perfect timing but with a good feel and control rather than a digitally quantized one, well, at least if we're not talking about this modern ultra-grid-locked metal...
That being said, I've recorded after months and months of reharsing and the confidence and muscle memory are so great that I could nail very difficult tracks in no time. On the other side, I've recorded with just 10 days of practice and I got very frustrated with very simple tracks. I finally made it but they would take me hours and hours if not days to record a single tune while screaming and swearing I'm a useless piece of shite.
As in many aspects in life, the difference is atrocious from being trained and being just "ready" to track because you already know the parts and the timing of the song. Not only physical but mentally, it can be just dead exhausting or piece of cake. You don't even have to think of the parts of the song that come next or the timing, it all comes together effortlessly. You just have to concentrate on hitting the skins the right way.
If the problem with your drummer is this, make him see practicing the song as it is (with click or guide, recording reharsals, playing accordingly to the skills, listening back to see if it fits the track and you're not overcomplicating things...) will give him the confidence to get to studio with the right attitude, that is: I'm going to give the best of me and nail it because I know I can, I've done it dozens and hundreds of times before.