Which group of voters played a bigger role in flipping WI, MI, and PA?

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Obama Trump voters, there can be little doubt about that, turnout was up in both MI and PA from 2012-2016 and most of the vote swing was due to vote switching, Trump got 164,000 more votes than Romney in MI and the vote swing overall was 460,000, most of the swing was due to Obama voters going to Trump as 150,000 voters switching would produce a vote swing of 300,000 for example.

In PA the situation was similar, Trump got 290,000 more votes than Romney and the total vote swing was 355,000 votes. Nobody stayed home in PA in 2016 as turnout was up almost everywhere from Philadelphia to small rural counties in the centre of the state.

In WI, turnout didn't rise and Trump got the same number of votes as Romney but considering that an equal number of Romney and Obama voters likely defected to 3rd party voters, the only reason Trump got the same number of votes as Romney would have been the amount of Obama voters who voted for him equalled his losses to 3rd party voters.