I don't know why this is so hard to understand. If there was miscalculation on the cost of acquiring Tulo, it was an overestimation of the cost, not an underestimation. Including Reyes in the deal was a negative for Colorado, not a positive. That was what Toronto needed to agree to the deal, not what Colorado needed. The cost in prospects would have presumably been even less had he not been included. The point of including Nolasco in a Reyes trade would be the same. The Twins wouldn't take on Reyes contract, so to get a prospect from the Twins, Colorado would need to include cash, or take back a bad contract.