Getting characters instead zetas

Hello there.I already have 7* Paz.Beq and IG12(actually i already got Bo-katan) and i have a question

Why i have Paz and Beq in my LS/DS battles?

As i know the drop rate of zetas depends on characters what you got from bonus drop(or did i mistake?)

I spend 1200+ cantina energy and got....2 zetas

Meanwhile my guildbrothers who havent chars Bonus drop got 10+ zetas 

Somebody knows how it works?


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