Honestly it's Week 5 of the season, no backup QB has been traded for anything big unless he is one hell of a QB or maybe just a disgruntled starting QB wanting off a team.
We IRed Sage because we have a much bigger need then a back up QB I'm sure the Giants tried to shop Sage around but seriously at this point in time, what team needs Sage as a QB? The Dolphins are 0-4, they arnt making the playoffs, why trade for someone who might make your team 3-13 by season end?
And I wouldnt call it a waste, we needed a legit back up if Eli went down last season who did we have behind Eli? Wasnt it Peytons old backup?