Top 4 wRC, plus Kirilloff, who was 6th but only played 88 games, or not, none of Lewis (58), Wallner (76), Jeffers (96) and Julien (109) played more games than any of Farmer (120), Solano (134), Castro (124), Taylor (129) and Kepler (130). Only Taylor, 96 wRC, was below 100, so it's not like they didn't perform at or above league average.
Doubling Wallner's numbers would have given the league more time to find and expose the holes in game, as the Blue Jays and Astros did in the play-offs (and I am a Wallner fan and understand he made adjustments throughout last season). Lewis, Julien and Jeffers all would have also regressed with more PAs as well.
I am all for getting the young guys in the line-up, but without those veterans (Castro is only 26) to fill in during times of injuries and ineffectiveness, and RpR is right, the Twins would have been closer to battling Cleveland for 3rd than running away with the Central last season (the ChiSox and KC were horrible last season).