As to the two receivers signed: WR Patrick Williams was barely mentioned here at all after a quiet preseason, but he should be familiar with the offense and have a short learning curve. WR Biren Ealy worked with the Saints and Ravens so far this season, but spent time dropping passes for the Titans in 2008.
I'm not really sure why they need a 6th WR on the active roster. There are a couple other guys on the roster, T Breno Giacomini and S Matt Giordano, who don't seem to fill a need on the roster either. Not that they especially need a 3rd QB or a 4th RB, but why did they let go of guys like QB Brian Brohm and RB Tyrell Sutton, and keep other guys like Giacomini, Giordano, and Williams?