Hey, only first one could be worth training. Please be aware that best regime for 18y old players is to have 6 of them and train 1/1 for 2 seasons. Having only him is waste of time, he can be one of your 6 trainees and then after 2 seasons you decide who you keep. Anyway, you won't get much gold for him on TL due to Potential, however if you train him for years, he could be good player. Search for Stars on TL with max. SS you can find. you will see where the cap is.
King Crimson