Considering who they have on the roster in Seattle, a total rebuild didn't make sense either. Hence why they did what they did. Same thing in Milwaukee, they had talent on the roster, just had to make trades, draft well and have some INT signings pan out so they could add around it. Milwaukee also didn't tank, but from 2012 to 2017 there were either mediocre or just flat out bad, giving them time to rebuild the farm. Hence why the Brewers are so dangerous even though ATM their pitching is vastly overperforming and their INF bats have yet to get going.