Just a thought.

I have an idea. Why doesn't kabam split all 5* heroes into two crystals. One contains KK and the other contains Colossus. In that case you decide whether to go for KK or Colossus, cos this "RNG' aint cutting it. Hell i will even buy it for 12k as long as i know KK and Colossus are not in the same crystal.
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Comments
Featured 5* = 15K
Half Trash 5* = 12K
Interesting
when it comes down to it for many, there's really only 4 or 5 5 stars you might actually be interested that you don't have already (for me, anyway), which means there are 60ish you range between meh and naw. I don't think I have a Colossus but I have a KK, and if I dupe her I could use the isos.
So yeah, sign me up for the KK crystal.