You just reviewed the smackdown before Survivor Series 99, and all the sense would've been for Test to win the title there. The fans loved him since the Shane match at Summerslam, and he looked like a more agile Kevin Nash. Wouldn't all logic have been to see him get a one month reign, before jobbing to Triple H at Armageddon where Stephanie turned on him. I remember watching SS 99, hoping it was Test and being disappointed by Big Show's music.
Two months later he was in T&A with Albert and a new Trish. I don't get it
Test basically flopped in the role he was put into in the WWF's eyes, and they seemed to lose faith in him really quickly after the Stephanie turn. And I think in hindsight if they had put the title on him for a month we'd look at it today with the kind of incredulous scorn that we reserve for things like the Miz main eventing WM27. Yes, it would have made sense, but that doesn't mean it would have been the right thing to do. If it makes you feel better, back in the day when we were watching it live we were all expecting Test to be the third guy as well.