I think that has to do with the instrument Blake is playing the tune on. I
think it's easier to play a tune with forward motion and drive when you're
flatpicking a single-line melody than when you're fingerpicking a full
arrangement on a guitar.
Have a great weekend,
it seems to me that his playing on the second version
is somehow more
danceable than on the first version, even without the backup. Of course, I
don't have a multi-track studio recording to experiment with, and it may be
that I can't trust myself to listen to a version with backup and imagine it
without backup. Still, that's how it seems to me. I'd like to know what
anyone else thinks about it. And as I said in an earlier message, you
might want to try listening to both Blake versions with the YouTube
playback speed set to 1.25.