How Crystalling Works - Unicorn Bias

[Blu Starset 1]

so you guys already know how the crystalling works. I have one question tho, flurry hearts parents are both unicorn ponies. When she was being crystallize they used their magic, if not, their horns glowed like they're casting magic. So does that mean that you should have a unicorn parent to make the crystalling work? also the crystaller, sunburst, also is a unicorn pony.. so the crystaller should also be a unicorn? any pony wants to theorize how the crystalling actually works?

Edited April 4, 2016 by Ponpon_Twilight