So, on the topic of our lovely new psyker beans! I want to try analyzing them numerically - that is, assigning numbers to the various criteria and seeing how they add up.
If you want numerical analysis to be fair, you should assign numbers on a more granular scale than 1-3.
Discipline should either be disregarded as a factor, or given only a slight weight difference, maybe 0.8, 1 and 1.2.
Again, this is mostly arbitrary, but there isn't too much of a difference between the disciplines, and psykers can get other disciplines eventually, so it's not a deciding factor. I used your ordering. Pyromancy is a one trick pony, and divination has very hard to replicate capabilities.
Give the Psyker power the weight from the chart, so 10, 11 and 13, with a divisor of 10, so 1.0, 1.1 and 1.3.
Less arbitrary, but it's a convenient numerical system that comes out of the box.
Disposition can stay on a 1-3 scale, but you could scale it down to 0.5-1.5 scale, to not skew the results too heavily.
However, it's very important, so it's got a broader range than the other two, due to how important i think chemistry is.
Again, arbitrary and subjective.
That way you have:
Ker Bemsk: Disposition 1, Power 1.3, Specialty 1 = 3.3
Cia Steblin: Disposition 1.5, Power 1.1, Specialty 0.8 = 3.4
Kezathi Zenza: Disposition 0.5, Power 1.0, Specialty 1.2 = 2.7
Other useful measurements would be Danger level, which is a negative. Both Ker and Cia score higher (lower) on this one due to Higher power and incredibly destructive discipline (respectively). Divination and Low Power, otoh would score lower, as the accidents would be less dangerous.
