At the risk of starting a technique war, I don't use cauls for edge gluing. I use biscuits for alignment. Cauls are more traditional, predating biscuits by several centuries, and there is absolutely nothing wrong with using them. I've been using biscuits for the last 25 years and have never had a join come apart. I like a biscuit join as it leaves the glue line completely exposed for cleanup when clamping up. Just my preference. Here's a glue up I'm doing right now for a coffee table I'm building. This panel will be the 48"x21" back of the table with six boards. The top is a 52"x32" glue up of five biscuit joined boards.
I've gone out to find myself. If I return before I get back, have me wait for me.
"Sawdust is Man Glitter"