Sven,
Two quick questions/observations. Here is the late Tom MacWood's synopsis of Barker's involvement at Merion based on the contemporaneous info provided from Merion Cricket Club documents unearthed during those long threads;
"Sometime before June 10, Joseph Connell, on his own account, retains H. H. Barker to inspect the Haverford property, sketch the property and provide a rough lay-out of a course. On June 10, 1910, Barker inspected the property and submitted a letter, sketch of the property and lay-out of the course to Connell."
Connell, representing the sellers, offers to sell Merion (paraphrasing) "100 acres, or whatever is needed for the golf course", which is likely his interpretation of what Barker sketched out. It wasn't until late in June that Rodman Griscom of Merion had CBM and Whigham out to the property for the first time and CBM's subsequent letter to the club discussing a theoretical make-up of an "ideal" 6,000 yard course does not mention Barker. In any case, if they did recommend Barker, which is certainly possible, there is no other supporting documentation I'm aware of.
One other quick thing...one of the later articles you posted mentions that Barker was brought to GCGC by "Jerome Travers". I'm not sure if Travers was a member of the club in 1907...competitive reports list his home club in 1907 as "Montclair". Might the reporter confused Travers with Travis?
Just some initial thoughts/questions before digging deeper, thanks.