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Actually would be more nervous about those guys than Fielder. ARod is a known roider. Cabrera and AGone are sketchy. Fielder seems to have to most natural build of the four (although who knows).
AGone had very favorable BABIP last year and extremely high IBBs the couple years preceeding. I feel hes a bit overrated and signed to several decline years.
If Cabrera, AGone, and ARod were FAs this season I'd personally avoid all three. Too much to risk on a gamble that they aren't cycling on HGH/steroids.
In that sense, Fielder is probably about as safe of a gamble for a top slugger that I can think of off the top of my head.