From Rotoworld, citing the Saint Paul Pioneer Press...
Vikings plan to limit CB Captain Munnerlyn to nickel packages.
Munnerlyn is expected to move to the slot coming off a down 2014. He allowed five touchdowns and graded out negatively in coverage by PFF last year. Terence Newman is the favorite to start opposite RCB Xavier Rhodes, with Munnerlyn and Josh Robinson playing in sub-packages. The Vikings also haven't ruled out adding another cornerback in the draft.
2nd last part I agree with. We can only hope everything finally clicks and being in a good environment helps him out. I get that Miami was a mess of a situation but I'm not sure why the Niners gave up on him so quickly when he's still under his rookie contract.
The Niners gave up on him for the same reason they gave up on most of their coaches.