MLB posted a video today that got me thinking:
Eloy hit .267/.315/.513 (.828 OPS, 117 OPS+, 116 wRC+) in a rookie year that was often interrupted by injury, rusty periods following injury, and so on. When he was healthy and recovered from whatever ailment he had been dealing with (as in, ~2 weeks after returning from an IL stint), he was awesome. He seems to have bulked up over the winter, and his swing looks great at the end of that video.
Defense aside (I think he'll improve to the point where he's at least playable), what do you expect from him next year? Something like .270/.320/.500 may be a reasonable baseline, but if he stays healthy, I think he's gonna take a massive leap. I wouldn't be surprised if he puts up .280/.340/.560 with 45 home runs (he was on a 41 home run per 162 pace last year), for example. Is that crazy?