I agree with others that I don't see Horford having enough skill to play PF alongside say RWilliams or Kanter. I think those 3 will rotate as our center, or if you prefer, our bigger big. I think people are going to be surprised at how much Parker and GWilliams are forced to play as the PF or the second big or whatever you want to call it. My guess is at least 24 min between the two in a more traditional 2-big line up. Maybe more.
I was one of those that didn't see Al as being able to be the PF alongside of RWill, at this stage of his career. Al has thoroughly proved me wrong on that one. I was a little less wrong in that I felt the 2-big line up would be seen more than people thought. I thought we would see more of Parker and GWill, I was clearly wrong on the Parker part of that but Grant alone has played the 24'ish minutes that I predicted.
Al has been a big surprise. As someone else said, his versatility and overall level of play has turned the PF position from a weakness or concern into at worst holding its own or even a strength. Defensively for sure, Al has been great but he has also made enough shots and has the skill to just keep the ball moving. He has been a key part of what makes the offence cohesive. Al has been everything we needed and exactly what we needed.