I think being compared to Pele or Maradona would be higher tbh.
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I'm sure both of those lads would've had a go at centre half, and right back, but I think big Duncan would've been at least their equal...
Except they had a go up front and ended up being the two best players ever to play the game.
Pele and Duncan were the same age but if you ask anyone of repute from that era, they will tell you Duncan was better than Pele and played every position on the park. He didn't get the opportunity to be the best in the world but he could have been.