Pat,
Having not played Seminole, I can't speak from first hand visuals, although I've seen a fair few photos on here and others places. As to what influenced his respective approach to green design on each, I think your comment on stronger, consistent winds would be a good starting point. The soil profile would almost certainly have been more sand-based at the Nole as well.
Perhaps, with more pronounced variety of elevation on the greens, the crowned or higher parts would have dried out faster in the intense Florida heat, particularly in summer, if afternoon thundershowers were absent. Ross, with his greenkeeper background, probably didn't want to kill the superintendent and his crew either. Pretty much hand-watering back then. Doubt there were any automated sprinkler systems then as well.
As to other period, Ross-designed courses to draw comparisons, that is a subject for more research. Did he build any other seaside courses around that time? I'll see what I can dig up when I have some time.
Happy Thanksgiving and kudos again for that great Muccifest this Fall!