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The Tampa Bay Buccaneers worked out Dallas Clark last week, and Adam Schefter reports that they are 'expected to make a move on him this week'. With news breaking that Kellen Winslow is to be traded or released, this makes some sense. The Bucs do not have a capable receiving tight end on the roster outside of Winslow, and Clark has been productive in that role in the past.
There's just one little problem with signing Dallas Clark: he's old, hasn't been productive since 2009 and has struggled with injuries the past seasons. Last season was especially brutal for the tight end, as he looked horrible as both a receiver and a blocker. Clark posted career lows of 9.4 and 10.4 yards per catch the past two seasons, and managed to produce just five touchdowns. While Winslow wasn't overly productive and is clearly declining, he certainly was more productive than Clark these past two seasons.
By replacing Kellen Winslow with Dallas Clark, the Bucs would simply be replacing a nearly-broken down Ferrari with an already broken down Lamborghini. You're not getting much mileage out of either, but at least they look pretty.