Take this how you want it, but Schoop was up here for 1: a lack of better options, and 2: because despite the fact that he was an offensive zero in 2014, his defense was almost good enough to make him a passable regular despite that. It's hard to call him rushed if he's providing positive value.
A second point of nuance that I'll bring up is that it might be worth considering minor league park effects. This was pre-Walltimore, and pre-baseball change to the MLB baseball. The park effects in Norfolk were so severe that for hitters, your MLE OPS was almost identical to your actual OPS. So while his Norfolk numbers weren't great, the awful hitting environment there suggested that he might be ready for Major League pitching anyway. (He probably wasn't, but again, lack of better options.)
If Holliday ends up being a +10 or +12 runs above average defender over the course of a whole year (and he very well might be, his OAA is already far above average) then you probably live with a .600 OPS from him, especially considering how big of a black hole 2B has been for the past 2 years. But of course he's far below that threshold at this point.
I don't think any of this indicates that Holliday was rushed. Machado had worse minor league numbers than Holliday at close to the same age, skipping AAA all together despite only putting an 850ish OPS there, and Machado put up a 1.3 wins in 1/3 season and 5 wins in his first full season.