The hole on the kerambits or CRKT Bear Claw as well as Fred Perrin knives are intended to make your grip securer in combat situation and to obstruct knife losing if someone wants to disarm you. This is right relaxing your grip on the handle you do not loosing your knife. All these holes are intended to put onto relatively strong and agile forefinger. The opposite side is the probability to get a harm if you are loosing the grip on the handle but the knife at the same time gets twist or something like it. Exactly as MelancholyMutt has described. But do you know any magnet with a single pole or any coin with a single side? I dont...
Well, returning to CRKT knives (I have them both). They are the tools specialized for basically another purposes, btw pretty handy in my opinion. Their holes are intended to put onto relatively weak and not too agile little finger. The described situation could be imaginable only if you would start to gut and skin your game before killing it completely...
Please take into consideration that when you are working with the game your hands are wet, bloody, greasy and generally fairly slippery. Add here winter conditions still warm game body and frost around and you will get almost complete picture.
Finger hole allows you to make your grip surer and as result safer. It also allows you to free your hand temporary for some other activity without putting your knife away and at the same time without risk of dropping it inside the game or into deep snow (or grass) around, for example. Believe me, these knives really are much smaller than you could imagine looking onto their pictures.
But you do not have to put your finger into this hole, the grip is acceptably sure and comfortable without it, for me at least.
The sheath certainly is not a dream one as well as the blade steel (I would prefer harder although more brittle ATS-34 or at least AUS-8 for such applications) and Zytel handle scales. But wow! what do you want for this price? They are affordable working pieces and you probably would be pressed hard to find more knife for each your dollar.