Brewers have a very good chance to win the NL Central this upcoming season. A lot hinges on what they do with the corner infield spots of course (And whatever moves, whether addition or subtraction, happens around the division), but honestly even with the rosters they are right now, I'd give the Brewers a good chance. Brewers pitching last year was very good; only 11th going by ERA-, but tied for 2nd in FIP- and T-1st for xFIP-. Combine that with the joint highest groundball % and the lowest exit velocity allowed (And Statcasts xwOBA says the same thing), and you'd expect good things going forward. Some better defense would help too. I think that pitching gives the team a very good foundation to build off, so with how mediocre the division looks in general, it should be possible to find enough offensive upgrades even on a budget to challenge.

The Cards should still be pretty good (They almost always are), but the Cubs have an enormous amount of work to do on their pitching. Beyond Hendricks and Davies they have almost no quality or depth in their rotation. Their starting lineup still looks decent, but we should expect some more subtraction and even right now they have no depth. The Reds' offense sucks, and while I expect their pitching to stil be good, losing Bauer and Iglesias (And possibly even Gray if rumours are to be believed) is going to hurt.

I don't even know what the Wash/Negative/Positive is in relation to? Comparing the positions to 2020? Compared to replacement level? Compared to league average? Compard to the rest of the NLC?

That offense has career wRC+ of 108, 103, 117, 71, 75, 102, 106 and 135. Equally weighted, that's an average of 102. That's more than last years NLC division winner had. Now of course career average isn't the same as what they'll do next year. I think it's reasonable to expect some to do better than that (Urias is my main bet) and some to do worse (Cain being the obvious one). But even so, take a projection system like ZiPS and it projects the offense (OPS+ instead of wRC+, but they're usually extremely close) as: 94, 112, 102, 80, 90, 98, 92, 135. For an average of 100. Still better than last years NLC winner.

Of course this takes into account neither the bench players or any eventual signings, and it's an overly simplified analysis. But you're simply reading way too much into the very small and, due to the circumstances, very weird sample of 2020 baseball, and taking the most negative outcome from it. I certainly don't disagree with needing big improvements at 1B and 3B, but the team is in a far better position relative to the division than most fans seem to realise. That's a sad indictment of the division at the moment more than this team being good, but as far as dvision standings go only the relative, not absolute, quality of the teams matter.