Aug 10, 2012; Kansas City, MO, USA; Kansas City Chiefs running back Cyrus Gray (42) is congratulated by offensive lineman Rich Ranglin (67) after rushing for a touchdown against the Arizona Cardinals in the second half at Arrowhead Stadium. Kansas City won the game 27-17. Mandatory Credit: John Rieger-US PRESSWIRE
This same transaction went down last week. The Chiefs cut Hemingway and replaced him with Ranglin and then swapped them again at the end of the practice week.
I believe the Chiefs are doing this because they need an offensive lineman to conduct an efficient practice. At least that's my guess.
We'll see if KC brings Hemingway back later this week.