And yes, they have similar impacts on the field... but one makes more than 10 times what the other does, and we're a team on a budget... and we flushed a sorely needed reliever along with Parker. It was an abysmal move.
I have already conceded that the money difference is large but I don't believe it is the impact you feel it is.
More to the point, as bad as Cahill has been here, I am not sure Parker would have been worse. Oakland's park is definitely the better place to pitch. Cahill's best season was there.
Ultimately they are both just kind of "bleh", which was my original point about trading prospects.
The only thing that makes this a "bad" move in my book is Cook (well and I have to watch Cahill every season).