A Steaming Kroak said:
The Howdah Crew and monster are treated as a single model, as per the Howdah Crew rule on p.45. The Unstoppable Stampede rule on p.45 says that a model with this upgrade has the devastating charge special rule. Since the whole monster is treated as a single model, and the upgrade affects the model, I think that the wording shows that the crew would get the Devastating Charge rule.
Mathematically speaking, I disagree with your assessment.
Proof By Contradiction
Given:
Devastating Charge: "Models with this special rule have +1 Attack"
Howdah Crew: "The monster and its howdaw crew are treated as a single model"
Suppose both the Crew and Stegadon get the effects of the Devastating Charge rule. so, by definition the Model goes from 8 attacks to 14 attacks (3 stegadon + 5 skinks normal +1 stegadon +5 skink devastating charge attacks). This is an increase of +6 attacks.
- The Stegadon and their crew count as a single model (Howdaw Crew rule)
- The Devastating Charge rule gives models +1 attack (Devastating Charge rule)
- A single Model should get +1 attack (8 normal +1 devastating charge = 9)
Thus, we are forced to conclude that each skink and the stegadon do not get +1 attack per the rules as written because that would result in the Model getting +6 attacks when the rule calls for the Model to get +1 attack.
Otherwise you are arguing that the stegadon & crew is a single model so that the Devastating Charge rule applies to the crew as well, and then ignoring that the stegadon & crew are a single model when applying the Devastating Charge rule.
However, as written, this does not say that you can't give the +1 attack to one of the skink crew members instead of the Stegadon. As long as the single model does not end up with more than +1 attack due to the Devastating Charge rule.