I'm related to David the Diver also and this is what I have gathered so far in relation to David Dobbin who married Anastatia Head:
David Dobbin (#3) b7 May 1895 Pilley's Island bp 27 Jun 1895 Pilley's Island d 5 May 1975 St. Patrick's, buried in St. Patrick's. Married Anastatia Head (I guess you have her birth and death dates).
David Dobbin (#3) is the son of David Dobbin (#2) bp 14 Oct 1856 Assumption RC Church, St. Mary's Bay, NL AND Catherine Roberts b abt 1871. David (#2) and Catherine married 31 Oct 1893 Pilley's Island
David Dobbin (#2) is the son of David (#1) Thomas Dobbin b 25 Oct 1817 St. Mary's Bay d 3 Jul 1900 St. John's (this is the Diver) and Elizabeth "Liza" Burke b abt 1818 d 20 Jul 1888 Little Bay Mines, NL. David (#1) and Elizabeth married 1 Feb 1845 RC Church, St. Mary's Bay, NL
David (#2) who married Catherine Roberts is the brother of my great-great grandmother Mary Frances Dobbin who married John Louis Walsh in Fleur de Lys.
Hope this isn't too confusing. With all the Davids I numbered them so it would be easier to read.
Alice (Drover) Hoven, Baie Verte