How Does Aquilino Lopez have an option year remaining?

This is simply confusing to me. From the transactions archive via ESPN.com:

2004:
April 25, Toronto: Optioned to AAA Syracuse.
May 12, Toronto: Recalled from AAA Syracuse.
June 11, Toronto: Optioned to AAA Syracuse.
September 21, Toronto: Designated Aquilino Lopez for Assignment.

2005:
July 30, Colorado: Purchased the Contract from AAA Colorado Springs.
August 3, Philadelphia: Claimed off waivers from Colorado and optioned him to AAA Scranton/Wilkes-Barre
August 20, Philadelphia: Recalled from AAA Scranton/Wilkes-Barre
December 16, Philadelphia: Sent outright to AAA Scranton/Wilkes-Barre

2007:
April 20, Detroit: Purchased the contract from AAA Toledo.
May 4, Detroit: Optioned to AAA Toledo.
May 6, Detroit: Recalled from AAA Toledo.
May 13, Detroit: Optioned to AAA Toledo.
June 7, Detroit: Recalled from AAA Toledo
June 10, Detroit: Designated for Assignment
June 11, Detroit: Optioned to AAA Toledo.
August 11, Detroit: Recalled from AAA Toledo.
August 19, Detroit: Optioned to AAA Toledo.
August 30, Detroit: Outrighted to AAA Toledo.


How do you use options? According to the Biz of Baseball:

If a player is not sent to the minors during a year, an option is not used.
If a player is on the 40-man roster in spring training but optioned to the
minors before the season begins, an option is used.
If a player’s optional
assignment(s) to the minors total less than 20 days in one season, an option is
not used.
A player may be eligible for a fourth option year if he has been
optioned in three seasons but does not yet have five full seasons of
professional experience. A full season is defined as being on an active pro
roster for at least 90 days in a season. (If a player is put on the disabled
list after earning 60 or more days of service in a single season, his time on
the DL is counted.) The 90-day requirement means short-season leagues (New-York Penn, Northwest, Pioneer, Appalachian, Gulf Coast, Arizona Rookie, Dominican and
Venezuelan Summer Leagues) do not count as full seasons for the purposes of
determining eligibility for a fourth option.

The one section of this rule that I overlooked is the 20 day requirement. A player must be on optional assignment for 20 days in order to use an option. In 2005, Lopez spent only 17 days on optional assignment, thus he did not use an option that season. Aquilino Lopez had an option remaining opposed to what I erroneously reported, and thus was able to be sent to Toledo to be stretched to starting.