2. Appealing to number of citations is an appeal to popularity (fallacy) because it avoids criticizing the content. It's also not "unseating" the big five, just demonstrating how the big five is incorrectly used as biological factor analysis. There are other applications is psychoanalysis the big five can be use for.
3. If you read the paper, you'd see that Table 3 is used in conjunction with other data to prove their hypothesis on projection-through-capacity bias.