trading 10oa for Samuelsson is crazy. and his contract for how many games he has already missed in his career gives you pause too. the devils cost of acquisition for guys like Marino, Siegenthaler, and Graves were much lower and they have given exactly what you would hope that a guy like Samuelsson would do.
Anyway, look at some of the low pairing defenseman the remaning playoff teams are icing - a lot of them just were buy low candidates/young guys. Devils don't need to spend prime assets on guys for the 3rd pair to get good results from them.
I think a guy like Hattaka would be fine in the 7th defenseman role too.