Just for kicks I setup a vlan between .7 and .1 and setup OSPF on it. But after reading
Here is the .7 route(s)
C *> 10.0.0.0/16 is directly connected, eth0 O 10.0.0.0/16 [110/1] is directly connected, eth0, 02:28:50
So I'm going to setup a vlan on the .6 router and take it back down just to see if that prompts OSPF to do likewise on that router.
There was low traffic on the .6 router so I pulled the core network interface down for a bit but it truly doesn't know any other route because traffic just totally died until I revived that interface again.