Have you ever glued up a top and had one board stick up a little
out toward the center where you can not put a clamp ?
it puts a dowel or dowels in the same spot on both or
more so if there is a small difference in the boards that
will go to the down side of the table top so there is
not a lot of scraping and sanding .
Dominoes, buscuits, now using a mortiser and dowels. Your best bet is to use cauls and good techniques to acheive a flat glue up. The mortiser might work well for smaller glueups but i would think it would be combersome for larger glueups.
I don't use any alignment tecniques except for cauls and clamps but if you need them to get it flat then l say use them.
The above notes re: cauls are correct. Using cauls properly will align the parts during glue-up and put pressure across the entire length. Using biscuits and loose tenons to keep parts that are not well squared aligned will usually eventually fail as the wood's memory is very strong.
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