Wide receivers who are 6'5" and 231 pounds aren't exactly the most common player types in the NFL.
That's part of what makes Calvin Johnson so unique. That's part of why Vincent Jackson could put up good numbers despite questionable quarterback play in his career.
And that's a big part of why expectations are nearly limitless for Mike Evans.
Last season, Evans was near the top of an elite rookie receiver class, and now he's overtaken Jackson as the Tampa Bay Buccaneers' X receiver, which means he'll be stretching the field and seeing one-on-one coverage -- if the defense dares try to cover him with just one cornerback.