Yes I agree with all that, meaning that's how I interpret the chronology.
I think we have Morinehtar and Romestar/Romestamo because, or at least possibly because, Tolkien could not find the older text at the moment, and couldn't remember the old names (again at the moment), so he invented new names.
I also think 'Blue Wizards' is earlier than Tolkien (in a letter) doubting the 'other two' had distinctive colours, and so (unless there is something else), this 'Blue Wizards' description may also be more popular than the 'other two'...
... although it's not hard to see why, if so
I note that Hammond and Scull write that with the letter Tolkien seems to have forgotten about these sea blue robes and so on. Possibly of course, but this seems to confirm that Tolkien never again referrred to these Wizards as blue.
That we know of so far? Anyway I digress
