I'm not a huge fan of the Hulet rankings, but they are still worth something. His Cubs list is right here, and it's interesting at the end.
The Career Outlook: The young hitter should be ready to assume the Cubs’ starting first base gig in late 2015 or early 2016 — assuming he can wrestle the starting gig away from the enigmatic Anthony Rizzo. Vogelbach should develop into an above-average first baseman albeit it with a shortened prime due to his body type.
Yeah, I'm not sure Vogelbach is going to move Rizzo off 1st. I'm also not sure that Hendricks is a surefire No. 4 with some seasons as a No. 3. There's no out pitch in his arsenal, so he's essentially locked into a innings-eater type (which is fine). FWIW, Sickels had Hendricks at 16, as a C+.