Showing two domain controller DC and GC on AD server, Need to remove one

I was abc AD server 2008 r2 with single domain controller on it and its working fine but due to issues in some roles on abc, I have create another xyz server and replicate with abc.

Now I've remove ABC server from network and changed the setting on PDC,RIP,infrastructure on xyz server.

Now On xyz server, Showing two Domain controller abc(as DC) and xyz(as GC) and getting event 1863 :This directory server has not received replication information from a number of directory servers within the configured latency interval.

I'm confuse with DC and GC ?

Goal : I need to remove abc(DC) domain controller on xyz server, If I delete this, then My AD will work? because server is working on live! So It is safe way? Suggest me?

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