There's at least 6 of those dudes dropping 1 - 2 bricks for me per kill. I've never had to wipe multiple times so that the team can fill their heavy. We split up in three teams of two. In my experience, everyone fills up the first time. But, if we do end up wiping, then all the heavy that wasn't collected is still there and continues to accumulate. Sucks that you've had to go through that, but it is still probably less than 5min to do that (rather than waiting for another synth to become available after a failed attempt). Edit: I'm typically the crystal guy and I can even see heavy that I missed in the "maze" from the rocks.