UNC has had its share of injury-damaged seasons. The loss of Kendall Marshall for the 2012 NCAAT comes to mind - along with extended injuries to Marcus Paige, Tyler Zeller, Ed David, Dexter Strickland, Leslie McDonald....
That said, it's certainly true that the absence of Zion (and Bolden) benefited UNC. With a healthy squad, I suspect Duke wins at least one of those games. Maybe both. Which is not to take away from the solid first and gritty 2nd game that UNC played, but simply to acknowledge that Zion really is that good. DeLaurier had an excellent game last night, so I'm not sure losing Bolden made much difference, but it might have.