The 25-year old striker scored the vital goal in Tuesday night's Capital One Cup semi-final second leg against Aston Villa to allow the Bantams a 4-3 aggregate path through to the Wembley final which is a giant leap from what he was doing four years ago.
"I actually brought big James to the club in 2009 when he was playing non-league football," said the former Bradford boss.
"He looked a bit raw. He was making £250 a week with Guiseley and working at the local Co-op. We paid a minimal fee of around £7,500, which was peanuts.
"James was doing well locally and when he made his debut for us he still had to work his notice at the Co-op. He would play for us on the Saturday and then head to work at 6pm.
"He is a great big lad and he was on the exact same money with us as he was at Guiseley, but then he lost his wages from the Co-op.
"So he was playing for less money, but he had a chance to make himself a professional.
"Now he has proved he is a handful for anybody.
"I always felt Villa would get a couple of goals and that Bradford would have to score to get through to the final.
"It is just amazing when you watch certain things unfold. When they won the corner which set up James' goal, I just sensed 'This is it'.
"It was a great leaping header from him and I am absolutely delighted."