You can use your 3 point shooters and still be a power post team.
Case in point, our very own Indiana Pacers.
We attempted 19.6 3 pointers in 12-13 and we were pretty clearly a power post team -> http://www.teamrankings.com/nba/stat...ate=2013-06-20
We attempted 18.9 3 points in 13-14 but we had transformed into a jump shooting team -> http://www.teamrankings.com/nba/stat...mpted-per-game
The amount of 3 pointers was never the issue for us. It was the amount of pull up jumpers after a PnR that was the real problem.