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Read here: Do not get rid of Dustin Keller.
Instead, keep him and get Shiancoe.
One of the underestimated attributes of a tight end system is the dual tight end system. Look at the two places it is run at heavily: in New England with Tom Brady, Rob Gronkowski and Aaron Hernandez, and in Carolina with Cam Newton, Jeremy Shockey and Greg Olsen.
Looking at the New England Patriots, all you need to see here is that they made a Super Bowl with the play of their two tight ends. While it was not the only reason, it did not hurt. Plus, Gronkowski recently broke the tight end single season yards record. But I understand what you might be thinking: it was all Tom Brady!
Look at Carolina instead. They had a rookie Cam Newton, who, if he was good at all, nobody expected him to be a dangerous passer but a mobile quarterback. Instead, you have the rookie passing yard record broken. All Newton had in Carolina was All-Star wide receiver Steve Smith and two tight ends in Greg Olsen and Jeremy Shockey. Plus, he was playing in a primarily run-focused offense.
Does any of that sound familiar? The reason two tight end systems are so effective is because they provide an additional two check-downs for the quarterback. If nothing is working deep, you've got three options close: your slot receiver and your two tight ends.
A two tight end system also provides extra run support. Teams would have to guess when you have Dustin Keller and Visanthe Shiancoe on the field—are they there to block for the run, or are they there to catch a pass?
You'd never know.