Pitcher Preferences

In my mystery league, I have Goose Gossage as my closer and tied and late preference. Tonight I had two games tied in the 9th inning. Gossage never pitched. The system pitched my two worst pitchers in those games. Why?

My best guess would be overall usage (IP for the Gossage season in question) along with possibly heavy recent usage in previous games. Was Gossage used heavily in previous games to the exclusion of other pitchers? That, I believe, might cause HAL to pass on Gossage to get work for others more in line with their actual season in play usage.