for the tendo treasure it says guaranteed 3-star character if a 10 draw is done but why do i always get blue ranked characters when i do a 10 draw instead of getting good characters. I waste 10 seal scrolls for a character I already have

so my thoughts are if you do a 10 draw on any treasure that says guaranteed a 3 star if a 10 draw is done then make it a high chance to get a purple ranked character

what do you guys think

another idea I have is if you get a character you do not want or already got from the treasure then you can trade it out with the same color character

for say if you get a purple ranked character you already got from drawing the treasure then you can trade it out with another purple ranked character same goes for a blue expect you only can trade it out for a blue ranked character.