Ver Hagen, Hardy, Wilson, and Rondon are all good organizational bullpen pieces. Ver Hagen is throwing 97 on the black and hasn't allowed a run in 8 games. With that group and maybe Krol, you at least have some workable parts. Sign like five FA relievers of various ilk and hope some of those stick, but bullpen arms need to be developed from within.
I can see throwing some Benoit type money at a closer, but they just need to add a bunch of guys with options and upside. They are out there every single year, the A's, Rays, Cards, and Padres seem to find them. No reason the Tigers can't.
Also James McCann is a man child, guy just does everything right. The bunt single in the ninth shows what a hoss he is.