I don't know how Tim is going to bounce back, but it's going to be hard to consider them a "terrible defensive team" next year.
They'll have a very good defensive 3rd baseman (top 5 last year), an elite defensive 2nd baseman (Madrigal), a very good defensive catcher, a very good defensive CF'er, and the talent at SS to be above average to good at the position. If Tim shows some consistency next year, you're talking about having ++ defenders at every important defensive positions (SS, CF, Catcher, 2nd and 3rd). LF and RF could be really bad, and 1st base won't be good until Abreu is DH'ing full time but with McCann and Grandal playing some over there it should be better.