I would say that you are right, Schneed. (Signing Bonus + Roster Bonus = Guaranteed Money)
I put together pertinent sections of the CBA that will help answer your question.
Article XVII Entering Player Pool
Article XXIV Guaranteed League-wide Salary, Salary Cap & minimum Team Salary
http://www.skinsfan.us/sf/Redskins/o...chneed_cba.zip