I’m no expert but if you do find any crappie of size they’ll be under or outside the big wads. Fishing in big schools hasn’t produced for me but sometimes you’ll get a few. I found a school on the Lee of a drop off and unde r the current. I spent about 30 minutes working those with all the smarts I had at the time. 8” catfish is what they were and I’d have sworn they were crappie. To my way of thinking, any school on the graph is worth some time to see what they are. At the worst you’ll learn something along the way.