I think what we should infer from his post is that he doesn't believe we should be looking for a third baseman because we already have one.
I understand what he's inferring.
But the author isn't giving an opinion on, nor asking whether we SHOULD be looking for a replacement.
He's outlining some of the Twins options, IF "the Twins are intent on moving Miguel Sanó to first base to improve the defense."
Personally, I'm ok giving Sano one more year to see if he can stabilize his defense. And, I'm a person who typically "overvalues" defense on this site.
But of the options available, I think only Donaldson is a clear net upgrade.
I definitely have no interest in Longoria.
I'm more and more intrigued by trading for a better defensive SS, and moving Polanco to 3B. I think upgrading SS is going to impact the game more than upgrading 3B.