Stallworth was a first-round selection by the Saints in the 2002 NFL Draft. Henderson was plucked in the second round two years later. Both players attracted scant interest on the open market as free agents.
Although Stallworth has experience in the offense of Mike and Kyle Shanahan from 11 games with the Redskins in 2011, he went unsigned last season until the New England Patriots picked him up as a December flier.
Once a deep-threat specialist with questionable hands in New Orleans, Henderson saw his role with the Saints gradually scaled back over the past few seasons. The Redskins already have a younger, faster version of Henderson in Aldrick Robinson.
Neither Stallworth nor Henderson is a good bet to crack the final roster, but the Redskins will have them on speed dial if Pierre Garcon and Leonard Hankerson suffer through another season of nagging injuries.
Follow Chris Wesseling on Twitter @ChrisWesseling.