Back to the original point though, it's difficult to do what this guy is actually trying to do. Not the drumming, but the whole concept of assembling an actual song with a live feel out of tracks done by different people at different times in different areas. It can be done, and it is done, but comparing it to real established bands in pro environments is foolish. Most bands that record live get the drums down first. They play it all live in the studio, but the drums are what's actually kept for keeps. And even then, there's usually a click track. With the live drums done, the others will come along and drop their shit on top. This way, any timing fluctuations are still natural because the guys are playing to the drums. Or if they do the drums separately, it's still the band's actual drummer, so the familiarity is there. They've probably rehearsed the songs, like pros tend to do, and know what's going on. In the case of session drummers, things are usually mapped out beforehand and the drummer's job is relatively easy. Songs will be written, arranged, and perfected beforehand, and there will probably be some kind of guide. A shaker, a cowbell, a handclap, something.
This turtle guy is doing things all wrong and backwards. He's creating problems for himself because he's stubborn and stupid.