The article makes it sounds more ominous that what it actually is.

For each cabinet post or prominent post, Democrats are going to pick an opposition member who will do nothing but criticize that cabinet member. I.e., there will be a "Democrat Secretary of State" who will do nothing but criticize the real Secretary of State.

It only matters because the media is going to take it seriously and give them airtime. I could declare I'm "FSK Secretary of State", but it wouldn't matter because my pronouncements wouldn't be headline news.