“Trump actually does remind me of another politician”
I disagree. You mention background, little attachment with GOP, ran as conservative, good name recognition.
I think it’s the sense he conveys that he understand America’s situation, has vast experience getting things done, and is able to speak truths that other politicians can’t do either because they don’t know the truths or because they can’t displease their backers or the establishment team they’re on.
The truth, as far DT is concerned, seems to be awfully flexible depending on the circumstances.