There has been some talk on using badge crates to upgrade heroes, and confusion in general. So I decided to post how I believe they work, feel free to correct me if I’m wrong!
Here it says that any equipable badge is given, furthermore it says that if not enough badges are equipable they made it so it goes to the next rank
Now to break this down it says that badges given have to be equipable by any hero this means that unless you have a blue 0 hero you have to fill all slots for that said hero or else it will have a chance to give you a badge for that low rank when we want a yellow badge. Example.
Here I have Flick at P1 and all badges in there. In theory no badges should be given for that low rank.
Hope this was helpful.