The other investigators working the case have some sort of agenda. They're either looking for personal redemption and glory, or someone else behind-the-scenes is pulling their strings to get the outcome to shake out one way or another. Woodrugh is on the case because he just happened to be on the wrong stretch of highway at the wrong time. The higher-ups dangled a promotion in front of him for working the case, but he doesn't really want it. (He just wants to be on the bike!) He's definitely the underdog of the detectives, and who doesn't love an underdog story?
She makes an appearance in the second episode, and it is rough. When I said "underdog," I really meant it. Seeing her trailer makes you totally understand why he would want to hop on a bike and ride the highway as far away from there as he could. (And I'm rooting for him.)
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