This week's mailbag gets into the Giants' rotation, why Framber Valdez remains unsigned, a thorough look at where Eugenio Suarez could land, the Tigers and Nationals, and more collective bargaining thoughts. Daryn asks:Why is Framber Valdez not signed yet? At present, the Giants' rotation looks like this:Like every team, they'll need reinforcements for injuries. I don't know that Zac Gallen would be enough of an improvement over the Giants' existing back-end options, but slotting Framber Valdez in behind Webb would be huge. As we get closer to pitchers and catchers reporting, the chance of Valdez getting a true five-year deal like Suarez decrease.