Yes small LMB do prey on small new yoy LMB. But they are not there in the larger numbers like BG. When you look at the seining article you will see that the survey is only on a very small area of the pond so structure should not be a problem.

All of the LMB females do not drop all of their eggs during the spawn. Some don't spawn at all depending on conditions. Most of the time the eggs are reabsorbed by the female LMB.