Grayson said: "Paul has been a big factor in us taking eight priceless points from five tough matches and I couldn't be happier with the way he has settled in.
"You always know what you are going to get from Paul.
"He will run his socks off for the team and he is one of the most unselfish players you'll ever meet.
"That was definitely one of the reasons he hasn't been scoring. But I knew he would get goals for us - I just didn't think they would come so soon.
"I brought him here because he is different to anyone else we've got in the squad. He's got that bit of devilment - nastiness almost - that you need from a striker. He is always right in defenders' faces.
"And he has got incredible energy for a player of his age. He sets a fantastic example both on the pitch and in training. That rubs off on the rest of the lads.
"All in all, I guess you could say I'm a bit of a fan of his!"