Sauron's Super Army?

[Belegorn]

Originally Posted by Mornorngûr

Actually I have just been doing some research and it is clear to me that Sauron actually held them and therefore could re-distribute them if he wished.

I agree with Alfirin, yes he held them, but the Rings worked in a certain way. If Sauron could freely distribute them and create an unlimited number of Wraiths why had he limited himself to only 9 in thousands of years? We know that the Wraiths would not disobey their Lord so he need not fear any rebellion from them.