Given all the soft tissue issues Eloy has dealt with (much easier to prevent than Moncada's lumbar issues) you have to call into question his diet, training and conditioning. A mid 20s athlete should not be straining their lower body every other week.
it's not even close. burger is a cromulent 3B, he's easily an above avg 1st base. Vaughn is an absolute stiff, which at 5-10 is a real problem. He has no range.