The Dalek's have no idea who he is.
He should be happy about that, he thinks.
Happy that the greatest, darkest beings in existence are gone from his perception.
He's nothing to them.
Then again, they've been through alot, him and the Daleks. They've always survived, where the rest of his race has fallen.
Hate is beautiful
And Rassilon, he misses that hate in this moment.