The mere fact that he would be a threat from 3pt territory would give him an relative advantage inside.
Combine great jumpshot & range, with decent driving & inside scoring, this will "keep the defense honest".
The defending center will have to close down on the shooter, and with low outside defense, will not be quick enough to prevent the shooter from driving all the way to the hoop.
Just imagine a play where you isolate someone like Ray Allen on Shaq at the 3pt line. If help defense is poor (or if other 4 players are good outside threats), Allen would get an easy lay-up/2 free-throws/an assist every time.
"Air is beautiful, yet you cannot see it. It's soft, yet you cannot touch it. Air is a little like my brain." - Jean-Claude Van Damme