As has already been mentioned in this thread, the Champions you receive from opening Crystals are determined by the drop rates for each Crystal.
Things like your current progression level, existing roster and the number of Crystals you've previously opened do not affect drop rates in any way. However, the more Crystals you open, the more chances you have to obtain the Champions you desire!
You can find more information about drop rates in THIS article.
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Things like your current progression level, existing roster and the number of Crystals you've previously opened do not affect drop rates in any way. However, the more Crystals you open, the more chances you have to obtain the Champions you desire!
You can find more information about drop rates in THIS article.