They do develop by their own by normal training but that's not enough because they will never reach their full potential and they will be pretty much like your normal players. So if you don't buy tokens I suggest that you buy 2 of them every season and power train them using the games greens by farming. There are many threads about that in this forum. Till then you have lost the period that these players are plenty because this is very early in the morning of every first day of a new season. They appear though in the middle of it but more rarely.

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