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No one, I think, least of all me, is advocating that we "dump" Ackley. I think he has a lot of value, for the reasons listed in these comments. Which means other GMs think he has value also.
The question is, does Paxton+Ackley bring you back something better than Paxton+Franklin?
As to Mat's point, sure we don't know Ackley's future... But this is true of any prospect. Remember when Reed was a can't miss prospect?