Duncan, MAAR, and Simmons graduate in '18 but there are no graduating seniors in the '19 class (assuming Mo leaves next year). That means in terms of scholarships, Beilein has to look at '18 and '19 as one pool (likely 6-7 depending on attrition). Currie has already taken one of those and there is no other realistic 5 on the radar (Shittu isn't coming), so there's no reason not to get Currie into the program as soon as possible. This also covers Beilein if Wagner (likely) goes to the NBA. And what if Teske doesn't advance and Davis clearly moves ahead of him? Currie covers them in '18-'19 in case of attrition.
The biggest need now is on the wing. So they can now focus on Tyson (on campus today), Hunter, Iggy, Locke, Weems, and Watts to fill those 6 scholarships from the two classes,
Bottom line is it looks like they took Currie over Nance, which makes good sense.