I disagree wholeheartedly with you. Barkley too was an undersized PF, but his smarts and ability to outwork others tour ex him into one of the greats to ever play the game.
Giving Faried does not require coaches to call plays for him makes him the ideal player to put next to Carmelo. He rebounds at both ends of the court and is the ENERGY the Lowenergy Carmelo needs to be great. You simply would require to have a true CENTER on the court to complement both players. The dude does not hold the ball on offense; he moves it because he knows his strength.
Draft a true center, play both Carmelo and Faried and have shooters in the back court.