He is quite obviously not in thrall to any individual donors, PACs, or other political forces. Doesn't mean that his independence is a good thing, it just means his views are of his own choosing.

His positions are those of the billionaire class because he is one of them. Marco, Ted, and John promote the views of the billionaire class because they are bought. (John Elliott was and is one of them also, and Ben may just be an honest but confused surgeon.) Either way, the billionaire class buys our political system. A good example, by the way, is tRump's view on eminent domain. tRump's views reflect his interests as a billionaire, end of story.

with the overt corruption of a political system. Rubio and Cruz have to comply with the wishes of their big donors or their campaigns come to a grinding halt. Trump is under no such constraint. He may or may not exhibit class solidarity on any given issue, as he sees fit. FDR, for example, was another loose cannon from the ruling class.

tRump is no FDR. Taking issues and deciding them on the basis of his personal interest will, as a rule, decide those issues in the interest of the billionaire class. (The example of eminent domain illustrates this.) No solidarity needed. This is where a class with a few hundred members differs from something like the working class, a huge majority.

FDR, by contrast, identified his own interest with his success as a politician and thus tried to act on the basis of the interests of the majority, so far as he understood them.

neither was or is under any financial compulsion to obey the wishes of their class.

and the politicians who'd do his bidding.