address that has never been online, will transactions in blockchain still balance? I understand that addresses do not have to connect to the bitcoin network/blockchain in order to be valid addresses, but I am mainly wondering about what can be seen in the blockchain if that address has never connected to the network.

So given this scenario

AddressA sends 1 bitcoin to cold AddressB.  AddressB has never been online.

There will be a transaction id for this. But what would a site like blockchain.info show for the balance of AddressB?

Would it still be able to aggregate all of the transaction that go to AddressB to show a balance for AddressB?
There is no "being online" concept of an address in bitcoin. 

An analogy would be to think of bitcoin addresses as if they were an email addresses. You can send to that address whenever you want and only the person with the secret key will have access to the contents of it. It doesn't matter if they are 'online' or not.

So to answer your question, when you first generate an address only you will know about it (unless of course you share it somehow).
As soon as you or someone else sends bitcoins to that address it will be present in the blockchain as part of a transaction