1) This may just be my mis-conception. The Sc'math seems to fill the exact same niche as a heavy warhorse (possibly light/medium based on your later creature list) for other races. It is a different animal but I assumed (incorrectly it seems) that it would qualify for Loyal Companion just like mounts (horses) do for other races.
3) That was my assumption (that Ss'ressen and mammals don't tend to get along too well).
2) Hmm. You may be right. Here's a more detailed mechanics breakdown (mostly because I'm really curious) between Sc'math and heavy warhorse (format is Sc'math vs heavy warhorse):
- Tier: same (1.5) - both common exceptional specimen
- Attribute Die: d10 vs d8 (missed that advantage of the Sc'math before)
- Defenses: 19 vs 16 Avoidance, same Fortitude/Discipline (20/16)
- Stamina: 46 vs 47 - negligible difference
- Wounds: 2 vs 1 - should both be 2 - warhorse needs to be errata'd (exceptional specimen adds a wound)
- AR: 5 vs 0 - definite advantage Sc'math (but can mostly be made up by barding which a Sc'math can not use)
- Pace: 30' vs 40'
- Initiative: 3d10 vs 2d10 - surprised warhorse is only 2d10
- Attacks: same bonus to hit; Sc'math has an additional (slower) option; Sc'math has equivalent to exceptional weapons (speed is 1 faster than "normal" for both attacks - missed that before); something is off with Warhorse damage (it seems to have a 2 die bump to Might for damage - either it should be d10 or it should have Powerful Attribute (Might) x2)
- Talents: 1 vs 3; both have Toughness; Trample can be useful but situational; Wary is nice
- Traits: 5 vs 1; both have Powerful Attribute (Might); Ravenous doesn't appear worth using (unless I'm missing something); Notable Attack is nice; Natural Armor is already accounted for above
- Flaws: 2 vs 1; both have Bestial Intellect; Sc'math additionally has Ssethric vulnerabilities (which can be hampering but can also be mostly ignored with Immune to Adverse Climate spell)
- Skills: 4 vs 3; same +5 bonus; Sc'math gets Mettle (which is quite nice)
Looking at it closer, the Sc'math is a little better than a heavy warhorse (primarily due to higher Attribute die, higher Avoidance, and faster attacks - effectively +1 hit, +1 damage, -1 attack speed, and 3 harder to be hit). However, Loyal Companion 1 mostly negates the advantages and by Loyal Companion 2, the warhorse is better (in my opinion - not straight apples to apples comparison). Maybe what's needed is something along the lines of a qualifier that the Sc'math does not gain the +1 skills and defenses for Loyal Companion 1 (leaving the +2 to command it and opening up 2+)?
I am disappointed that the Sc'math can not be a Loyal Companion (admittedly likely primarily due to my long-standing assumption that it could be). I'd still be very curious for an explanation on the reasons why it can't be from Henry or Pete.