The results can sometimes be skewed by "exceptions" that Google tends to make in it's rankings. A common example is that almost all the top ten pages might be high-authority pages with many backlinks, but in positions two and three, there are some YouTube videos listed in the results, with no page authority and zero backlinks. This makes it appear as if the top spots are easier to get than the lower ones, but it's really just an exception, since Google treats video listings differently than normal listings.
The same can apply to image listings, news entries, product listings and a variety of other exceptions that Google makes, but that we can't predict.
To learn more about interpreting the SECockpit results, here's an article that might be helpful: