This is easy. To get Grienke it would have taken a 7 or 8 year deal to beat the Dodgers at around $25 mil a year. It is possible he is effective for this deal (current fluke injury notwithstanding) but if he was to suffer an injury or a loss of effectiveness that would be a lot of money to have on the books. That is real space that will be needed to potentially lock up Sano, Meyer, Arcia, whatever other prospects might make it while also hampering any other free agent signings/trades down the road. This is a lot of ifs, but it is a huge risk for a team like the Twins who are and will be middle of the road in revenues.