First I want to agree that the spot of the ball was absolute BS. But the way that the review system works in the CFL, and other leagues, is that there has to be conclusive evidence to overturn the call on the field. Trouble is that every angle shows MBT fumbling and almost immediately that ball disappears from view and is never seen anywhere. Thus there is no chance of a successful result to a challenge, going by the rules. Despite my questioning MOS more and more as a coach, I don't blame him at all for not challenging.