When evaluating a text for its argument, the most relevant question to consider is:
Is there enough evidence for the claim?
This question directly addresses the strength of the argument being presented and whether the claims made are supported by adequate and relevant evidence.
While grammar and storytelling can be important for clarity and engagement, they are not primary factors when assessing the strength of an argument itself. The diversity of sources can be relevant, particularly in establishing credibility and breadth of perspective, but the key focus should be on the evidence supporting the claims made in the argument.