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Their remark 'can struggle with fly balls' does look like a superficial assumption.
One piece of middle ground here, is that I'd thought his offspeed stuff was crackling but out-of-control, like Mike Campbell's from some years back, and that it was wait-and-see as to whether or when Robles would be able to deploy it consistently.
A picture that seems to emerge here is that Robles is more in the Jon Lester change-speed template, than in the Scott Kazmir hard-and-wild template.
Which is interesting in itself.