The only thing is that it is well known that Scot has a pre-existing back condition. The others sat out for different reasons.
Here's a list of Pollard's injuries:
Apr 10, 2006: Missed 1 game (plantar fasciaitis).
Apr 9, 2006: Plantar fasciaitis, day-to-day.
Apr 7, 2006: Missed 2 games (sore left foot).
Apr 4, 2006: Sore left foot, day-to-day.
Mar 21, 2006: Missed 3 games (foot injury).
Mar 17, 2006: Foot injury, day-to-day.
Jan 27, 2006: Missed 10 games (back injury).
Jan 13, 2006: Back injury, day-to-day.
Jan 8, 2006: Missed 1 game (flu).
Jan 5, 2006: Flu, day-to-day.
Dec 4, 2005: Missed 5 games (stomach virus).
Nov 25, 2005: Stomach virus, inactive list.
Nov 9, 2005: Missed 3 games (calf injury).
Nov 1, 2005: Calf injury, inactive list.
Mar 22, 2005: Missed 1 game (sprained right ankle).
Mar 20, 2005: Sprained right ankle, day-to-day.
Feb 11, 2005: Missed 1 game (back injury).
Feb 9, 2005: Back injury, day-to-day.
Jan 21, 2005: Missed 1 game (back injury).
Jan 19, 2005: Back injury, day-to-day.
Jan 14, 2005: Missed 20 games (back injury).
Nov 28, 2004: Back injury, day-to-day.
Nov 23, 2004: Missed 6 games (back injury).
Nov 10, 2004: Back injury, day-to-day.
Nov 9, 2004: Missed 1 game (back injury).
Nov 6, 2004: Back injury, day-to-day.
He missed 10 games 'cause of his back last season after 29 in the previous one.