I can't buy the notion that the Zho psis are going to shoulder a disproportionate load of the risk to buy a front-line grunt infantry edge that evaporates - in some cases literally - when you drop a nuke on their position. Most of the decisive operations are being carried by armor, ortillery and commandoes.
But that (only the upper society being able to bear arms) is not something unseen in human history. Indeed, it has been a very usual take in armies along history to asume that the defense of the country to be a
duty and privilege of the citizenry, and in many cases citizenry were only the upper strata of the society.
From Classic Greece or Rome, where only citizens (and they were the upper strata) could be enlisted as lregular army members (non-citizens could join the Auxiliaries and even reach citizen status there in Rome), to most feudal societies, where only nobles were allowed to bear arms (and so to be true fighters, though some militias might join them in emergencies), only those upper strata were true fighters.
It was not until the US and French Revolutions that the whole population (or at least all free males) was seen as citizenry and so responsable of the country's defense.
And remember in Zhodani Consulate only nobles (I'm not sure about intendents) have right to vote, so I guess proles are ot consideed citizenry in the whole sense of the word...
No, I'm referring to the fact that the descriptive text on the Zhodani Consulate tells us that the approximate percentage of nobles in Zhodani society is 5.6% and that it also tells us that there are roughly 8 intendants per 3 nobles. And then I did the math and rounded a bit for convenience.
I can't find a reference in AM4 that actually states percentage of psionics in the society, but let's take your 20%. Now, let's apply it as a comparable figure for the military, on the reasonable argument that the typical noble/intendant wants more of a career than to be a potato peeler and target for CBMs. Maybe half that percentage goes to fill officer billets, give or take a bit; current U.S. trend's 13-14%, but that might be on the high side. In a battalion, that leaves about the equivalent of a platoon-strength psi-commando force for special operations. And that sound's about right - the bulk of the grunt work carried by the typical sad sack who fills out most armies, with nobles and intendants filling out the command ranks and a platoon of elite commandoes available at the battalion level for special operations in the battalion's area of operation - like reinforcing a hard-pressed infantry company or penetrating into the enemy rear to knock out an enemy artillery company.
I have no access to AM4 (one of the few CT alien modules I don't own, though I reada borrowed copy years ago), but if the numbers given by Tobias are there (and I have noreason to doubt about it), that gives the aprox 20% he talks about...
That's regular army, of course, not the Guard; the Guard is an entirely different case, but that is an elite division, and there aren't many of them.
As I understand Zhodani army, most of it is made by upperstrata, and many (if not most) of them are psionic trained. The cannon fodder is basically warbots, but even them need to be psionically controled (through the Psionic flickers).
IIRC, I read that the main requisite for the Consular Guard is not just psionics, but specificaly teleport ability, as their main misión is infiltration and extraction though teleport to conduct their missions. That makes me think that not all the non-officer nobles/intendents are in the consular guard, but only the selected ones that are able to teleport in combat.
There's a good deal of ball-parking in that. Not all nobles are psionics, and as I said I couldn't actually find a percentage, but it's a workable estimate.
ITTR having read in several places that all the nobles are psionically trained, though some of them are not powerful enough on it to be really useful in such a role..
I guess (no reference found about it) that not all nobles' siblings are nobles too. After all, in historical societies only the eldest son used to inherit the true noble status, the rest being lesser, usually non inheritable semi-nobleships, as the Spanish
Hidalgos. And in MT:V&V is said that only the third noble's son was noble, so again limiting the inherited nobles somewhat.
Maybe (again, my guess, not found any reference about it) only one noble inherits nobleship in the Consulate (I'd bet the one with higher Psi potential), the rest becoming intendents...