I don't think it is that unusual for an architect's style to evolve and change. Especially if his career spans a long period, and that period includes the early, somewhat primitive beginings of golf architecture along with the acknowledged high point. From Walton Heath (1903/1904) to Berkshire (1928).
Fowler was assisted by Simpson at Berkshire, his distinctive hand is evident. I'm not sure how much these courses have changed over the years, that could be a factor....from what I have seen the original West Surrey, Beau Desert and Delamere Forest were of a similar style.
Cruden Bay was an existing golf course redesigned by Simpson, he deserves credit there.
Knole Park and Manor House are Abercromby.
Also, it has been my observation that an architect's inland style is often different than their links style. Colt is a prime example, his bunkering style is toned down by the sea, Simpson's as well, and although he did not do too many links courses, I think that it is the case with MacKenzie too. An exception to this rule appears to be Hawtree (and Taylor), from what I have seen of early photos of Birkdale, their links bunkering was equally flamboyant inland and on the links.
How much of Fowler is left at Saunton?