Bought an iPhone Owner having trouble deleting iCloud account
I recently bought an iPhone6 that is still tied to an iCloud account. I contacted the previous owner and it turns out he had lost the phone over a year ago and wasn't the person I bought the phone from. Lucky for me after we talked a little he is a pretty good guy that offered remove the phone from his iphone account so I could use it. (I had already checked with the phone carrier and they said it was good to go on their end.)
Here is the issue, he sent me a message that he went into itunes and deleted the phone but it still shows locked to an iCloud account. So he said he would go back and see what else he could do but now the phone isn't there so he isn't sure what to do..... what can I tell him? I want to make it as easy as possible for him since he really didn't have to do this.
iPhone 6 Plus