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We have had with our young hitters. As you mention above "so much talent", and I agree there are many talented bullpen arms in our system. But young talent that shows flashes early does not always equal year in, year out production. When a few (or almost all) inevitably fall short of their talent, you are left with the 2011 or 2012 run scoring issues. Or the terrible 2013 bullpen. Even our shiny closer option Farquhar only had an ERA+ of 88.
The amount of money to get a couple good relievers is so low, and by no means does getting 2 or 3 proven guys stop you from developing the 4 or 5 best young, cheap arms to go with them.