Hello Turner919, You would be correct in that, without vsan and management failing over to the alternate connection would cause your issue.
Ran into a bit of an issue and I think I have found the issue but would like to confirm. Configuration: 5+5+1      v7.0.2.00400 During a fiber cut all the VM's failed to spin up at the other site, the cut was on our 10G ring. However the witness traffic vlan failed over to an alternate connection. Since the witness was still able to see both sides but vSan and MGMT cannot would this be cause our issue?  
Stretched Cluster Networking