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In either case, whether DHCP is necessary or not for the ease of use of LMCE, you still don't need two network cards to do it.

Well, I have no problem letting a core do DHCP for diskless booting of the MD (or just assigning them IP addresses in general).  The problem is:
1. I don't want my entire network to be DHCP, which means the router won't be doing it and aside from using it for diskless booting, neither should the Core.
2. The Core shouldn't need to be multihomed to do DHCP anyway
3. I don't want the Core to be in charge of my entire network; I already have a network set up... I just want the Core to do a few things, such as serve media.

Unless the Core is acting as a router and/or firewall for the network (say, sitting between a cable modem and the rest of the network), I see zero reason why the Core would basically be required to have 2 network connections.

...why does it need two network cards?  I don't plan on using this as a firewall / router, I just want it to serve media.  Unless it's required that it acts as a firewall or router, I can't think of any reason why it would need two network cards.