10-15 starts can make a heck of a lot of difference on a team trying to contend. Just ask the 2017 Brewers, who needed just and additional 1 or 2 games to go their way. And what about other injuries or ineffectiveness? Yes, Chacin has a large salary. He also was markably above replacement level last year for the first time since 2013. Putting even 2 of the 5 rotation spots into the hands of some combination of Chacin, Gallardo, Suter, and Woodruff doesn't seem like a plan that sets you up for long-term success next season. Factoring in that Nelson may not be effective when he first returns, and the almost certainty that someone else gets hurt, you're relying on 2 young pitchers and 2 journeymen to potentially carry a lot of weight, and that won't end well, IMO. Far more likely to succeed is a rotation of 1)FA Pitcher X 2)Archer/Other Trade Acquistion X 3)Anderson 4) Davies 5)Nelson when healthy/Chacin, with Gallardo/Suter/Woodruff in your pocket to fill in as needed.