Motte, Schaller and Eriksson are 1, 2 and 3 in PK time on ice for returning wingers. They aren't very good players, but they do provide something of value - penalty killing. If you have a terrible PK, it absolutely destroys your club. Unfortunately the Canucks don't have many guys in the top 6 that kill penalties.
Motte also scored 9 non PP goals in 74 GP, from 4th line icetime. Those are good 4th line goal totals. He also only had 80 career NHL games experience coming into last season - so it's possible there is more there.
Eriksson is the guy that just doesn't fit. His slow, passive style is the furthest thing from what Travis Green wants from his forwards. At least Schaller, and especially Motte can skate and play with pace.