You keep saying this and its malarkey. The Brewers weren't taking Montas and his buyout if the Reds didn't take Junis. They sent Junis and $1 Million to the Reds specifically to make the buyouts a wash. They saved the max savings they could find. My guess is the Brewers threw in Wiemers to get the Reds to take Junis. Without Junis in the deal, the Brewers would have walked away.
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The defense thing is nice to have if Wiemers hits. The Reds could improve their defense anytime they want to for basically nothing if all they want is a good defending minor leaguer who can't hit.