The Senate can be very useful when it does indeed apply a second, sober look at legislation. That's not what's happening in this case, though - Rona Ambrose is continuing Harper's approach to controlling Conservative Senators to do the will of the party in the Commons and to abdicate their Constitutional role. The whole Duffy affair was infused by Harper's intervention in Senate affairs, as was Pamela Wallin's use in illegal campaign work by a Senator.