[Sombre]

According to the literature, Saurus are actually quite smart. It's just that their smarts are all warfare based, while the skinks are better suited to administrative duties and communication. This leads to them being falsely identified as stupid, when in fact they are just specialised/instinctual.

Oldbloods, having lived for thousands of years, are very experienced and it would stand to reason that they haven't lived that long by being stupid. Of course their brains are still limited to combat.

The luck comes as an additional blessing. The various sacred spawnings of Huanchi, Chotec etc all have their own benefits in addition to being sacred and those with the mark of the Old Ones, the greatest of all marks, will get boosted stats and personal luck. They are marked by the Old Ones to do great things, after all.

Being cap only will mean you'll see very few of them. It's hard enough getting people to build anything other than mages, without limiting what I'll put on recruitable commanders.

It's interesting you mention the 'alien' aspect of Lizardmen, because that is something I want to get across. They are cold blooded and unemotional creatures whose motives are entirely obscured other Warhammer races, since everything they do follows Slann interpretations of knowledge left behind by the Old Ones and various portents. In a certain sense they are almost like the Rlyeh of land, trading the unknown of the deep ocean, for the unknown of dense forest and the New World. They're definitely going to be one of the stronger Warhammer races, but they'll also have some clear disadvantages.