_msdcs delegation name servers list is limited.

Hi,

In the _msdcs  delegated zone, I can see that only 3 of 10 DC's  are listed as NS servers for the delegation.

Is it something I should worry about? Or the zone will be served by all the Domain Controllers / DNS servers even if they are not listed as delegated?

The zone is AD Integrated, so it should be replicated everywhere.

Thanks!