We've been harping on the fact that Buffalo Bills defensive lineman Spencer Johnson has been playing defensive end through the first week of team OTAs. The second week of spring practices began this afternoon, however, and Johnson was lined up at defensive tackle, per the Bills' official Twitter feed.
Johnson was working with the second unit defensive line inside - lined up next to Alex Carrington, with Chris Kelsay and Shawne Merriman working at defensive end. (Naturally, this also means that Mark Anderson was getting first-unit work at right end, replacing Kelsay, who worked there last week.)
The take-away here is two-fold: Dave Wannstedt is rotating his defensive linemen not only through specific units in practices, but also positionally - though the latter may only be applicable with Johnson, who appears set to take on an end-tackle role as one of the team's primary reserves up front. With the new 4-3 scheme relying heavily on the defensive line, expect a heavy amount of rotation throughout the season.