OKC is an easy team for Minnesota to go small against. Taj Gibson isn't much of an offensive threat. Easy to hide a combo forward on him. Be it LeBron or Battier. Get extra shooting and floor spacing on the floor.
I think OKC has the (slight) advantage when both teams stay big. Both teams will defend each other very well but I think OKC have a bit more offense in their lineup than MIN does. Taj Gibson and Dwight Howard will make life very difficult for LeBron (and Monta) without more floor spacing on the floor to stretch the defense.
I think Minny's main rotation should look something like this.
PG - Avery Bradley, Mario Chalmers
SG - Monta Ellis, CJ Miles
SF - Shane Battier, Kyle Korver
PF - LeBron James, Serge Ibaka
C - DeAndre Jordan, Glen Davis
I think Glen Davis is the only other big man who can defend Dwight Howard adequately after DeAndre Jordan. Serge Ibaka and Greg Stiemsma both too weak physically and too poor as post position defenders. Dwight would have a field day on Ibaka/Stiemsma.
They can move in Chalmers if they need more shooting but I would be very hesitant to lose Avery Bradley's defense on Derrick Rose. That is a big asset for MIN's defense.
I think this is a series where Oklahoma could be punished badly for it's lack of quality at SF. Not sure how best for them to matchup against those small ball lineups. Keep Taj Gibson on the floor? Or drop him and play Belinelli instead?
If Minnesota were to go small, in terms of bench + coaching, I Minnesota would have bench advantages at PG (Chalmers > Maynor), SF (Battier > Fields) and center (Ibaka > Mahinmi) + would be even at PF (Haslem = BBD) + a coaching advantage (N.McMillan > Mike Brown) while OKC has an advantage with Ben Gordon over CJ Miles. If the Wolves stay big, I would switch that Mahinmi vs Stiemsma battle in OKC's favour even out the bench battle.