Wolf_Q,
I have a similair problem with my 2 Akita's.
Some dogs will share everything and anything, but
some dogs are just more primitive in their behavior even
if it's un-wanted behavior in our point of view.

I have a feeling Nebo is, or trying to be pack leader among your dogs. If this is correct he is warning your other dog to
stay away from what is his. But you are Pack Leader over
Nebo, and that's why he allows you to take away his
posessions.

This is what I go through with my dogs.
All dogs are fine with kibble bone treats and toys
together, but when it comes to their food bowls or a special treat like a juicy bone from the butcher, I could have
WW3 on my hands if I am not carefull.

I take the easy way out, they do NOT get any butcher bones and I usually feed them seperately unless I am with them.
It's funny if I am their watching them,
they do not dare act up with-eachother, but as soon as I am
not watching, Bam! a fight could develope over special stuff.
Not sure how to stop this behavior, but if you
are watching them, you can forsee something that might
happen and be ready to re-act to Nebo before
he does. (put him in his place since you are his boss.)

As I say I take the easy way out and prefer to be safe than sorry.
So if I happen to be outside and Sheba starts getting
close to Rocky while he might still be eating,
I quickly re-direct her away from his space or
do not let her outside till he is finish, or I remove his food bowl.
If one starts to growl at the other, I move fast and get that
dogs attention on me, insead of the other dogs
before the other dog re-acts etc.
When I feed them pig ears, I watch all 3 dogs to make
sure they each stay away from each-others space
till everbody is done.
So for me, I just try to prevent a situation so I do not
have to correct.
I bet Carrie or Dixie D. will have some good behavior
training tips.

I feel for you, I know what you are going through
trying to keep your dogs living in harmony.
I never had this problem until I got Akita's.