We're in a time where you see guys with more positional versatility. You've got guys like Baez who play every infield position. Does it bother him? No, it only increases his value and future payday. Moncada is a heck of an athlete. I don't think it's a stretch to say he could handle 3rd, 2nd and RF. I get being cautious about moving him to RF with his leg injures.
But allowing him to prove his worth as a multi position player helps him and the Sox. If you can land Rendon, you do it.