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Think of it like this, the mortar in essence is not binding to anything other then the block above it. So, it acts just like the block is a little bigger then it really is. That block will still be able to move freely from the wrest because the mortar will crack beside the next block when the freeze thaw happens.
As far as the error factor, I don't think it would be a big deal other then chipping some mortar. Not fun, but not a big deal if caught early in the process.
I am not recommending the process until I try it personally and watch it for a year or two. Will it save time, Yes. Is it shown in installation manuals, No. I was simply putting out a idea I have been given by a very experienced installer.
Obviously Josh thinks a bad idea, that's fine.
The walls we install are supposed to flex and move with the freeze cycle, this process will not prohibit any flex in the wall.
Different strokes for different folks, some lay on 2a only, some lay on 3/4 clean only, some lay on sand, some lay on stone dust. This guy laid on a 1" bead of Mortar for a very long time and never had a problem.
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Matt
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