Yeah its a bit of a gamble but I don't think the Cubs could have gotten a difference making starter without having to trade Happ/Russell/etc. They didn't want to so instead pivoted to having the best and deepest offense combined with a very deep bullpen that can hold the fort down if the starters can't get it together. Also, the starters getting it together is still a legit possibility when you consider their track records, age and in the case of Darvish return from injury. I think its a smart play albeit not completely ideal.