You may be right. When a team drafts your replacement the season before your contract year, it is a statement. Evidently the saints don't think CGJ is ready yet, but think Jenk is a better short term plan than Bell for the price.
We haven't had trouble filing this role (Harper, Vaccaro, Bell, CGJ) in the past. Also, I think a lot of teams have been able to fill this role around the league. The SS position has been a tough one to make money in for a couple seasons now.