There aren't many Dwarves. In order to become 'superstrength certified', you need to spend at least a week of training under different strength levels and learning how to leverage superstrength and how to not crush everything beneath your newly-augmented fingers. All told, the Sororal* Order of the Dwarf is only thirteen strong. Plus Sara, whose nickname is leaning towards Snow White, but hasn't quite cohered yet.
The entire complement is here. Ten of them are rigidly held at parade-perfect attention, facing the competitors. Sarah Riggs and James Griggs have, since say one, competed monthly for the title of being the Better -iggs. And after Arrakis seems like a good time to conduct the Ceremony. Mary Williams, as the Mistress of the Sororal Order of the Dwarf is standing by with the 'medal' - in reality, a removable patch.
*It was Mary Williams' idea, and the men were amused enough to accept the logic that since she had the idea, she could name it what she wanted. And she had designed and ordered the patches.