It is possible to "cook" your data to tell the story you want in almost any situation. That being said, since this analysis wasn't about Tyrod, but rather the league as a whole, it is interesting to see where Tyrod stacks up.
The obvious issue with this post is, without seeing the rest of the data, it is tough to get a feel for it's accuracy. As an example, if Blane Gabbert is consistently rated higher than Matty Ice or other Probowl QBs, there is likely an issue with how the data is being presented.