Let's not leave out Espinosa's power when talking about his offense. There's a segment on this board that would be much happier with infield pops than Ks from Danny. However, when you just look at his WAR in the abstract and point out how it is 7th over the past couple of years, you kind of ignore that it is a counting stat, he has played full time, and much of his value is generated by the part of WAR that is the shakiest (estimates of defensive value). Clearly, his OBP has to improve and he has to get his Ks down below 25% or so to become among the best 2d basemen, but I would think the market for him is a bit better than a MR (not a starting pitcher, not a primary set up guy, not a closer, not a position regular). Right now, you'd have discount the defense a lot and expect the power to vanish to say he is not at least an average 2d baseman who a few teams would project as a SS, where his offense would look even better.
All that said, keep Rendon healthy, get him reps at 2d, and you are in a position to deal Espinosa.
With Rendon, Skole, Moore, and the possible reemergence of Marrero, the infield can shake out a number of ways in 2 years just among the internal options. RZ's shoulder deteriorates and he can't throw, there are 2 potential 3d basemen in Rendon and Skole. that does not happen, there are trade candidates up the middle among Espinosa, Rendon, and Lombo. ALR could be replaced by a Skole / Marrero combo, or just Skole, or Skole / Moore. Moore may stay as a corner OF and righty PH. I like the options.