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Based on what I've seen so far. There is a strong chance this draft will produce our future middle infield (an above average one) which in itself would make for a successful draft.
I also think Poythress and Seager will factor into the future Mariners 25 man in some capacity. Not saying either will be a long time starter, but I think each will be good players in the role they are given. Seager likely as a patient lefty utility bat, and Poythress at the minimum as a guy who could be a good platoon at 1B or DH.
If the M's get that out of their first draft under Z, then they did an excellent job. And of course the potential is also there for a guy like James Jones or even a Steve Baron to progress into a useful guy on the 25 man roster.