I'm still relatively new to Linux. My question is why wouldn't Fedora Server be considered an alternative for the CentOS diaspora? It seems a better fit than Debian to me.
Package managers are irrelevant. The relevant part is the quality, methodology of testing, existing written policy and technical requirements for the software. That you at the end deliver it in a deb, rpm or what have you, amounts to little.
Debian Stable (with its quality, Debian policy, testing, and stability of package major versions) is closer to CentOS. Fedora would be, as Debian Unstable, too fast moving for CentOS usecases.