Another Roster Move

The Jets drop a fullback and pick up a linebacker:

The New York Jets have signed free agent LB Ryan Fowler and have waived FB Jason Davis. The announcement was made by Jets general manager Mike Tannenbaum.

Fowler, a 6'3", 250-pound Duke product, was released by Tennessee on Sept. 6, 2009. Fowler spent two seasons with the Titans after signing as a restricted free agent on March, 20, 2007. He has played in 62 games (21 starts) and has recorded 119 total tackles with two forced fumbles and one fumble recovery. In two career postseason games, Fowler has posted one tackle. Originally beginning his career in Dallas, Fowler signed as an undrafted free agent with the Cowboys on April 30, 2004.

I must be missing something. What's the point of signing guys only to cut them a day later? The point of signing somebody is you think they improve the football team.  How much do they really help the team if you think of cutting them within 24 hours? It's not like we're talking about changing the starting quarterback, but it's starting to seem like this team is just making moves for the sake of being active.