Have at It: Most significant departure

We had overwhelming participation in Tuesday's SportsNation chat, no doubt a response to our two undefeated teams. As it turned out, one of the questions I didn't get to sparked an idea for this week's Have at It.

Several of you asked who I thought was the NFC North's top free-agent acquisition so far this year. I think we'll get to that at some point in 2011, but being the negative cynic I like to be, I want to turn the question upside down. This week, tell me which free-agent departure has most hurt an NFC North team.

Candidates include:

As always, give me your thoughts in the comments section below. I'll post a representative sample, along with my own thoughts, by the end of the week. Have at It.