To whom it may concern:
I am making this recommendation in lieu of the upcoming 6* champions.  My concern is this.  When a champion is maxed out and you pull them again you are rewarded with Iso8.  However humble the gesture; the direction you are taking this game requires an immediate change.  The change is simple and i am more than confident over 90% of the gamers may agree with this rewards change.
A) 2* lvl 99 - if character pulled after that you are not rewarded iso8.  You are rewarded 3* crystal shards

 3* lvl 99 - if character pulled after that you are not rewarded iso8.  You are rewarded 4* crystal shards
C) 4* lvl 99 - if character pulled after that you are not rewarded iso8.  You are rewarded 5* crystal shards
D) 5* lvl 99 - if character pulled after that you are not rewarded iso8.  You are rewarded 6* crystal shards
Any gamer can conclude that the easiest thing to get in this game is gold and iso8.  What we need is the ability to upgrade our players.