Well, that actually puts you in a bit of a pickle... So lets take this step by step to try to reach an agreeable conclusion.
-14- sounds like it earns its keep
Kept
-16- if you feel that this is "Your" knife and don't want to lend it out, keep it. But, remember that later on.
-15- food prep.
kept
-2- loaner for those unprepared, probably looking to swap out for 4/5.
(Here lies the problem)
I am a Butcher by trade, so I can justify your selection of knives for food processing and the particular cuts and direction of cutting (flank, flap and skirt for instance). On top of that, digging a hole with my food prep knife is also considered a bit of an issue. The 16 is your goto knife for anything else and you depend on your 14 for rough work. So those 3 are kept. But you may find the 16 being redundant when a lighter mora isn't being lent out. Unless you have a custom sheath, the mora is easier to draw and put away reliably while being lighter in hand, plus the steel takes less work to touch up when it does go sour.
Your 2 being loaned out is not much more than a nice gesture, and a heavy one at that. I suggest a
stainless mora, it would work just as fine with having a bit less of a worry regarding cleaning for the uneducated masses and less nagging in the back of your mind. As well as being lighter, and causing the user to actually have some consideration towards usage vs just beating the wood with a now dull bk2.
Plus, a stainless mora is pretty easy to sharpen, especially with a ceramic rod/stone (which leads me to my next point).
Crovan responds Very nicely to ceramic, makes camp touch ups easy, and works out Very nice on the 4.
Swap your 2 for a 4 and a mora. Lend the mora out, use the 4 for heavier camp wood tasks and cross your fingers that you either get a 5 from santa or can save up and get one before they are gone.
In all honesty, the 4 is Very capable, including trap making. When the "try stick giveaway" came around, I made one using ONLY a BK4. It is a Great knife and you won't be disappointed.