I believe that the Knights run big camps with the objective of giving guys the opportunity to show why they warrant a second look. Years back, I recall Kevin Raine showing his will to play a physical game against players who'd already made the team. That was impressive enough to get an invite to the main camp, and ultimately won a spot on the team.
It's a process, much like threshing grain. The chafe gets discarded, and the valuable kernels are kept. A bigger initial sample size, provides more possibilities, and among those "possibilities", is where those who really WANT TO PLAY are found. A lot of players show up at camp, but only a few really stand out, and that's what the coaching staff looks for. Attributes like "heart" and "desire" get exposed, and those character qualities are desirable if one is looking to build a winning team.