Fix 4* placement and segment/reward hardcore players

Slarow

4* placement rewards are currently broken, as the only people who ever earn them already have almost all of their 4*'s fully covered. One way the devs could help those of us who are attempting to make the 4* transition is the following:

Split the 4*'s into two groups, the most recent half and the oldest half (update lists as they are added).

Make two bracket types in each time slice, one that has a newer 4* as the top 2 placement reward, and one that has an older 4* as the top 5 placement reward. Make HP rewards much better in the newer 4* bracket. Also make the 1k progression reward old in the older bracket, and new in the newer bracket. Make the newer brackets a good deal smaller. Give players the choice of which bracket type to join. Players in the same shard would still fight across brackets.

The result will be that those who are already in 4* territory and have all the older characters covered will pick the newer bracket as they will want the better HP and have more need for the newer cover. Those still trying to make the transition will most likely go in the older bracket as they actually have a shot at the placement reward there, and it and the progression rewards will be useful to them.

This provides a stepping stone of accomplishment (advancing to the hardcore bracket) between "dominating 3*" and "Useful 4* team".