The problem of low hit points on humans

[Arralen]

Graeme Dice said:
It doesn't matter if you give him bodyguards, or supporting troops, since melee attacks are effectively all concentrated on the most survivable unit in a square.

Where did you get this from?
I haven't found it in neither the Dom2 nor the Dom3 manual, nor did Kristoffer or Johan ever mention this, AFAIK.
And my own observations tell me otherwise, too.

In a single combat round, every single attack will be dealt to him (or to friendlies in the same square until they are dead) until he dies and they move onto the next target.

This is a contradictory statement - in itself and therefore to everything you're posting here.

In fact, I think I have empirical evidence that at least the target of all attacks vs. a square is chosen randomly, if not every single target.
Which one from the following units would you consider "most survivable unit"?:

Light Infantry #29
HP 10, Prot 15/8, Def 13 (actual fat in the test battle: 8, therefore no reduction)

Heavy Infantry #40
HP 10, Prot 17/14, Def 13 (actual fat: 6, no penalty)

Jaguar Warrior #727
HP 12, Prot 6/7, Def 13, regen 1 (actual fat: 4, no penalty)