I've used Rocky Mountain Gator 2 Blades mechanicals along with fixed blades for the lastten years. I shot a doe with a NAP nitro head two weeks ago that did not pass thru. In light of that I pulled out a Gator and shot a big buck last Wed. that was a pass thru and pile up in 50 yards. Every deer I've shot with a Gator has been a complete pass thru. Also, keep in mind that a complete pass thru doesn't prohibitsuccesfully dispatching a deer. Obviously angle of shot has a lot to do with pass thru. If you are shooting a quartering away shot and hit the opposing shoulder bone, you more than likely won't have a pass thru shot. Ifyou hit the heart or both lungs, you'll have a dead deer.
With the proper shot placement, most any decent broadhead will be lethal.