Joseph can still play a little, but given age plus salary, it makes sense.
Rhodes went from Top 3 CB in the league to sieve pretty quick. Seems the nagging injuries he seems to get one of game finally caught up to him. Spielman left the door open for both to return on the cheap if nothing is up to their liking in FA.
I think Waynes and Alexanders both walk in FA. Which will leave them with former first rounder Mike Hughes, who's been injury prone/mediocre, and Holton Hill, who's probably getting suspended again as I'm typing this. CB will definitely be address in the first 2 rounds (again). Waynes is more likely to come back than Alexander.
At DT they have the very average Shamar Stephen and Jaleel Johnson and the last years 65h rounder Armon Watts, who the seem to like a lot, but Ross Blacklock may be an option at 25.
And we can't forget Everson Griffen still hasn't re-signed yet. This defense is going to look a lot different. You still have studs in Hunter, Smith (who's getting up there) and Kendricks. And Barr can play at a pro bowl level at times, but after that yikes. Anthony Harris is gonna cash inn FA, backup S Jayron Kearse, who's a key STer and look solid when filling in, is gonna leave too since he's tweeted about being underappreciated. So they're going to need a S too (Winfield Jr?), but Zimmer hates Safeties so they'll probably just sign trash Sendejo again. I'm glad Zimmer wasn't here in 2012, no way he would have let Spielman draft Smith.
The VIkings have a lot a work to do on defense and the OL if they wanna be any better than 7-9 next year.