1. I use the same bow set up for turkey, bear, hog, and deer so I honestly cannot tell you about the gobbler guillotine.
2. I have never worried about the arrow passing through, but I believe the premise is because they want the arrow inside the bird to do more damage, and to help prevent it from running away since they do not bleed much if at all.
3. Again, I've never worried about it. Most of my shots have been pass thru's, but the arrow kind of sticks in the dirt while the rear of the arrow is in the bird.....I think it all evens out, but what do I know.
4. Here is what you should be aiming at
Patience is a hunters best friend when it comes to turkey hunting, and don't forget about their exceptional eyesight.