Obamacare's main impact is in the individual insurance market and it's a real stretch to blame increased employer pass through costs on the ACA.
I think you're wrong about this. Obamacare has had a major impact on employer-sponsored plans. Many of the less expensive plans that were available to employers prior to 2010 aren't available anymore. Obamacare didn't just require individuals and employers to buy medical insurance; it also included a whole host of mandates for what the insurance coverage had to include.