Completely besides the point.
If you want to argue that they should have drafted Wells or Greene that's a completely different argument (and one I might agree with)
But that wasn't a factor when they let Turner go and it's already well after the fact when the decision of whether or not to give Sproles 7.3 million was made.
They can't go back in time and draft Wells or Greene. Their options were Tolbert+Bennett+Hester+rookie, Tolbert+Bennett+Hester+overpaying some other free agent RB on the market right now or Sproles+Tolbert+Hester+rookie.
Of those options, I prefer the last.
I wouldn't mind if they signed Thomas Jones, though.