GUEST,

I'm surprised they're not on YouTube. I think they're historically important. Maybe I should digitize them and upload them.

Of course they're there :-) You just need to know the songs to look for. In terms of tracks by the Wailers that are totally in the style of U.S. r&b (doowop, etc), there are a few.

It Hurts to be Alone

I Need You So

And this one which I posted myself, alongside the original by The Moonglows:
The Ten Commandments of Love

But remember why the Jamaican music industry mainly started: to provide the local market with the U.S. r&b style records that the sound systems had been playing. So they absolutely were emulating Motown, etc artists.
In the first half of the 60s some Jamaican artists made recordings like the ones above, in full on 12/8 meter doowoppy style.
An early example is this 1961 recording:
My Heaven

After that, with the advent of the rocking' ska rhythm in 1964 (the remainder of the Wailers' early recordings), the US r&b/soul/whatever influence remained in the vocal part, but the accompanying rhythms were distinctly Jamaican.