When you say better temperament, I take it you're talking about Lee? Mick Lee, at 16, finished his first season at Boston with an average of 9.13. The following year (17), he finished the season with an average of 9.22 in the British League Division One, which, imo, was the hardest league in the world at the time. He was also the British U21 champion that year.
Following season (18), topped the averages in the British League with an average of 10.64. Also won the senior British Final and was part of England's winning World Team Cup, and made his 1st world final. Cooper is a great talent, but a bit premature to say he's the next Mark Loram or Mick Lee, imo.