It's not just cropping. You can see the background ghosting through him (the "bass Justin" and "electric guitar Justin"), and sometimes he "leans in front of himself" etc.
If I had to guess: he took a frame of video of the background (probably from the video in which he was drumming) and used that as a basis for creating "subtraction" for the other videos. Exactly how I'm not sure since I haven't played with this kind of thing yet.
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