Warren Greatrex is convinced Cole Harden can play a leading role in the Sun Bets Stayers' Hurdle at the Cheltenham Festival.The eight-year-old has not won since he claimed the Grade One prize, then known as the World Hurdle, in 2015, buthe looked to be returning to the peak of his powers when second to Unowhatimeanharry in the Cleeve Hurdle at Cheltenham on Saturday. "It was a great run by Cole Harden on Saturday.It was probably his best run since he won the World Hurdle, I would say, just in the way he jumped and stayed on again," said Greatrex. "I think the winner won cosy enough. To be beaten by one and three-quarter lengths by Unowhatimeanharry looks solid as he is unbeaten since joining Harry Fry. "We know on better ground he is a much better horse."We are not saying he is going to win, but you know what you are going to get with him and he does seem to be a spring horse."It's great for everyone involved to see him back to his best."