If Rendon can play competent second, Rendon and Skole or Moore is far better offensively than Rendon Espinosa
No offense, but I'm not even sure than Rendon has proven yet that Rendon > Espinosa offensively, let alone that he's so much better offensively that it outweighs lesser defensive contributions.
Raking in high-A for 9 games is great, but at the same age as Rendon last year Espinosa was looking pretty advanced himself at high-A (.264/.375/.460). If Rendon puts up a .900 OPS this year in AA and above, I'll start believing he might outperform Espinosa offensively at the major league level.
But it's not "easy" to OPS .800-.850 as a major league MI, which is at least what Rendon will have to do to be more valuable than Espinosa.