Remove the blue essence needed to improve 'mastery'

**Why can not I improve my mastery without blue essence? ** To get a blue essence - I should get the chests, right? And in order to receive chests, I must receive the highest rank for other champions. In other words, in order to improve the skills of his champion, should I raise it from other champions? Where is the logic? I ask to remove unnecessary requirements for increasing the rank and leave only merit in this champion. You can increase the number of required 'mastery tokens', if necessary.
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