Can I use short rib bones alone to make beef stock? I have almost 2 pounds of uncooked short rib bones (I cut them off short ribs  then froze them). There is very little meat, if any, on the bones. Am I able to make beef stock using just these bones? Should I add one of the small marrow bones I have in the freezer (I don't want it greasy) or buy different bones? Or do I also need to add meat to have a tasty stock that will 'gelatinize'? In other words, are short rib bones enough?

I've made chicken and turkey stock countless times, but never beef, so I am truly clueless. I generally don't add meat to a chicken stock, just whatever little I haven't cleaned off the carcass, and wonder if I would get the same good outcome with just beef bones. I have read this question, but it doesn't address my question of short rib bones. What bones for beef stock.
This question Making Beef Stock, while telling me HOW to make the stock, doesn't tell me if short rib bones work.
Thank you.
A lot of the flavor comes from the marrow of the bone. Rib bones will need companion soup bones to help them. Alone, the flavor will seem weak or watered down. 
Now, if you are willing to put in the time.... Bake them first at 325f for an hour, let them cool and hit them with a hammer to crack them. you might want to cover them with a towel as not to send splinters about. This will allow the flavor to come out more during the reduction phase of the stock.