There seems to me to be far too much distinction being made here between him in so-called "Chopinesque" mode and the modus operandi that fuel his later work; the influence of Chopin is, of course, paramount in his earlier music but I have never had the impression that this dissipates, let alone disappears, in his later music. Chopin himself developed a harmonic language that proved to be widely influential (and even hints at quartal harmony are present in works such as the Fourth Ballade), so this is perhaps no small wonder, really' I have no doubt that Scriabin was as aware of Chopin's forward thinking as he was of all other aspects of his work that continued to exert influence on him and encourage the exercise of his own thought processes...
Best,
Alistair