I'm having trouble with the IF part of winning the 3B job out of spring training. Unless he's something out of this world (and even then), I just don't think he'll start that soon.
If he makes the bigs this season, I'd guess it'b more along the lines of a June call up, and even then there might be a learning curve similar to what he has in AA (though he he figured things out and really raked). In short, I don't think the Rockies will force the issue with him
For that reason, I couldn't place him with Moustakas/Machado/Middlebrooks. Definitely lower, but I'm betting on a later arrival and a learning curve.