If I remember, uncommon training you only get uncommon heroes but now with uncommon training you can get common and uncommon… there a sign to buy apple and I bought it and you say oh that the sign but you can get apple or oranges… wth…
Sometime I think all these tread and stuff written on here is worthless and no body read them…
As has been the case for me for close to 3 years now (probably since the inception of the game). Uncommon training gives a straight 50/50 split on 1 stars and 2 stars.