Can't say I really follow what was going on there.. As far as:
Game win scores from gold I (+10 per win was not guaranteed, as if I was in diamond)
This will always happen when your rating is above the league rating range, so in Gold 1 against other Gold players there's no score bonuses for scorestreak etc above 2799. If that was posed as a question and not a statement? :)
Rank referring to diamond III (336 in diamond)
Seems that once you go up a league you are always included in that ladder, even if your CP drops 🤔
I appreciate your response, so I know that when the rating is over the threshold whether you don't upgrade the league the +10 is not guaranteed, but I don't understand why my ladder is still the diamond one and not the gold one since the rating obtained at each battle won is +3 and not at least +10, I think that if my ladder is diamond one also the rating should be referred at the diamond league. Moreover, I got 40 chests (diamond III) and not 30 chests (gold I) at the end of the season. It is odd!
I think the logic for this being is primarily to: