You can bet that most any of those guys have no problem yanking every big one they can find off the bed and socking it down in the livewell only to cull as many times as they can later in the day. So it’s not just a five-fish limit that gets displaced.
One of the many reasons I pretty much gave up derby fishing and the last time I did fish one during the spawn, I purposely passed on bed fishing. Not perfect by a dozen long shots strung together but I do practice what I preach where fish care is concerned.