What difference does it make? This is about the simple math, not about the indisputable fact that RJ is a better player than everyone on the Spurs not named Tim, Tony or Manu.
You cannot add RJ's contract to the Big 3, fill out the rest of the roster, AND stay under the luxury tax unless you are going to have a Big 4 and 9-11 players on minimum deals.
The only way the Spurs will consider adding a 14-16M contract to TD, TP, and Manu will be for an all-star level big. You think Toronto will give up Bosh for our extra contracts? I didn't think so, either.
There is just no way the Spurs add a perimeter player that makes more money than TP unless they deal Manu.
You can contemplate a trade for a perimeter player on a contract the size of Caron Butler or Corey Maggette and possibly make it work, but RJ and VC won't work
You can have Tim, Tony and RJ on the Spurs. You cannot have Tim, Tony, Manu and RJ. That is, in the real world
I don't know how to make it any clearer.