Nick,
This has got to be the best scholarly research I have ever read about the Bronx. I have always been focused on the Mosholu Parkway South section from Gun Hill to Webster Avenue. I knew that the road was called Middle Brook Road, since the stream that was there , know as the Mill Brook, was often called Middle Brook. Since the Boston Post Road crossed this stream at Van Cortlandt East, I just assumed the Indian name of the Mill Brook was “Mosholu”. I was not aware that Tibbetts Brook was called “Mosholu” at any time, since George Tibbetts acquired his property in 1668. Just thought “Tibbetts Brook” was the original name. I believe you have it correct, 100 %.
Now I can not wait for Kappock Street and Katonah Avenue!