I was thinking along the same lines. His fingerprints are on some fantastic courses, but sorting out how much was Colt is really difficult.
Is Portrush / Dunluce 100 percent Colt? The club's website makes no mention of OTM but didn't he lay out the original course?
Colt played a huge role in Ganton and if anyone deserves the credit above the title it's probably him -- but you absolutely are correct not to call it a "Colt."
Also interested to hear your rationale for Rosses Point -- especially given Colt's opinion of Swinley.
Swinley
St G H
Sunningdale New
Kennemer
Mark