Paul
I do think Colt had an impact on Abercromby, maybe not at first directly but indirectly. His next design was another collaboration with Park, Coombe Hill in 1909. It is another step forward naturalistically, not nearly as angualr. Perhaps it was a natural evolution for the two men, or maybe a response to Colt's work at Sunningdale and elsewhere in the vicinity.
Abercromby eventually teamed up with Colt at Addington (1913-14), which no doubt effected him. And at The Addington (New)--which some consider his finest effort--he teamed up with Croome, who built one of the naturalistic classics, Liphook.