Y'know, the more I think about it, the less I think Costigan was biased for/against any particular teams.
I remember being told by a Warriors fan that he was biased against the Warriors. That took me by surprise because I'd never noticed it. So the next time, I paid close attention, and if anything, he seemed to be biased in our favour. I always found it interesting that there were Warriors fans saying he was biased against the Warriors, but I also found fans of other teams saying he was biased against theirs.
But something perhaps worth noting is that when he was criticial of the Warriors, he was equal to - or, in most cases, less critical than - the very Warriors fans accusing him of bias. And yet when we played well, he waxed lyrical about us.
I dare say, that if it wasn't for the Australian accent, the accusations of bias would have drastically reduced in both quantity and volume.
So the facts that his criticisms were less than those of Warriors fans, that his criticisms weren't consistent, and that other fans felt he was biased against their team when they played the Warriors, has led me to a simple conclusion: rather than being anti-Warriors or pro-Warriors, I think he was just purely pro-league.
I know that sounds like a cliché, and perhaps it is, but I think it's a warranted call. He'd get particularly animated when a really impressively good or bad play was made, regardless of who did it. The guy really does appear to have been a league tragic who called it the way he saw it - complete with Australian accent and outrageous rhetoric.