Are the prospects the Cubs gave up that good? None of them have done anything overly impressive this year. I'm sure they all have some level of potential, but it's not like the Cubs gave up any major building blocks, is it?
Harden has a very reasonable salary, and Gaudin is having a good year. The Cubs took a risk, but it's not like it's a huge one. Best case scenario, they got an extremely talented young pitcher and a reliever who helps. Worst case scenario, they gave up four moderate-ceiling prospects.