In hindsight I don't like my own use of "branch" but leaving semantics aside, horace's theory uses Ultima as an progenitor of the CRPG family as a stat-heavy, combat-centric genre and Ultima just doesn't fit that mould. Even before U4, the series just isn't very stat-heavy and this disproves the theory as a whole, although I agree there was a significant element of the genre that was combat-centric.
BG's ancestor is Ultima. I'm not arguing the quality of BG as a great (or bad for that matter) RPG but simply that it can't be cast aside as an adventure game.
I'm not casting anything aside, I'm telling you what draws people to the game. its adventure game elements drew people to BG and other BioWare games. Every review of those games I read admitted that the combat sucked but it was still a great game. In effect it was an adventure game.
As for U4 not having very many stats and therefore not being a combat/development based CRPG, well, since U4 and all Ultimas through U6 were in fact combat/development CRPGs simply based on the amount of time spent in game on that activity, your point is clearly moot and not having a lot of stats is clearly not mutually exclusive with being a combat/development based game.
(U7 was an adventure game *in effect*- and not surprisingly a game that started to appeal to a much wider audience).
I truly believe that a lot of CRPG 'fans' have quite a bit of cognitive disonance about this. They don't like combat and they don't like character development, they really like a cool escapist story to tool around in.
But that doesn't seem 'grown up' enough so they pretend to be CRPG fans. They're adventure game fans.
It's funny, when a non-CRPG is said to have "CRPG elements", everybody knows what that means: character development and stats.
And yet in games supposedly WITHIN that very genre which is DEFINED by those elements, those elements are scoffed at and ridiculed as relics of a bygone era.
Game design is becoming a lost art. There doesn't seem to be a single person employed at Bethesda, the last big gaming house for single player PC CRPGs, who understands even the basics of it.
Storytelling and world building ain't game design.