And DT's take a long time to develop (at least based on past history)...so if the Bills took Ngata or Bunkley and he sucked the first 2 years...and Donte was playing great for DET, BALT or whomever...a thread would be started "man we needed a Saftey, why did'nt we think of Donte Whitner"
Some fans will always find something to be negative about.
Bills needed a S who can be a playmaker...and they got him.