The Neo Kantian schools of thought were either about justifying science or culture which clearly were the last things on Kant's mind. Rather the question of Kant and of Metaphysics in general is "What is it all about?"
I might offer here a suggestion--that had he known about Leonard Nelson,[friesian.com] he might have seen the exact kind of development of Kant that he was seeking. [With Leonard Nelson the answer to How is synthetic a priori possible? The answer is by means of immediate non intuitive knowledge--i.e. faith.]
I certainly did. For faith needs a certain amount of justification. Those that think they are supporting faith by divorcing it from reason, are undermining real faith and fall and bring others into lying faiths.
[As Brand Blanshard wrote in a similar vein: "Now the result of this line of defense [of faith and morality by means of divorcing faith from reason] is not really to save morality, but to throw all morality into confusion."
So as all Rishonim [sought for a synthesis of faith and reason] I see in Leonard Nelson a way forward.
