Williams said: "Scotty is only about 5ft 9ins but he's great in the air and will always get you a goal - that's why I brought him to the club.
"He was my first signing, he's a man's man and he's great in the dressing room. If you're in a battle you certainly want him with you rather than against you.
"I think I look a bit younger than him but as long as he keeps performing like that and looks after himself he could play for a while longer yet."
Williams continued: "That was one of our most complete performances for a long time."