More than four columns?

I am sorry if I am missing something, but after reading the documentation I was under the impression that I can have more than four columns on a page (up to sixteen on a full page?). I am trying to add team members to a page and can get a row of four, but when I try do five across it ends up with two oddly-sized team members per row. I have tried using “1/5″ and “five” as the width and I made sure my first and last column were appropriately tagged. Can I not have five columns on a page? Or am I doing something wrong? Here’s some example code:

[column width="five" position="first"]
[person name="John Doe" picture_url="" title="Developer" ][/person]
[/column][column width="five" position=""]
[person name="Jane Doe" picture_url="" title="Developer" ][/person]
[/column][column width="five" position=""]
[person name="Jimmy Dean" picture_url="" title="Developer"][/person]
[/column][column width="five" position=""]
[person name="Jimmy Delancy" picture_url="" title="Developer"][/person]
[/column][column width="five" position="last"]
[person name="Lola" picture_url="" title="Developer"][/person]
[/column]