Joy,
That's really splendid. Looks like you may have cracked it. I know it was suggested on this thread to go after Robert because he had the less common name and your hunch for North Crawley would seem to be spot on! The fact that you can see back in time to more Roberts back to the late 1500's is terrific.
I talked to my cousin last night and I will post some information below she gave me. She's on vacation so I don't think she'll mind if I post. She did really systematic thorough research on our line about 5 years ago and was in touch with a woman who had your same ancestor. They hit a roadblock in actually establishing the brotherhood of William and Robert at the time, but with Robert and Ann Church having those children in 1695 and 1697 there's confirmation.
Also she reminded me that in her research William my ancestor, the son of William the tailor who had married Constance Houghton had a son, another William who married an Elizabeth Ingram. Sound familiar? (Further back it looks as if an Ann Bitchenor who was mentioned recently (can't remember the variation on spelling) married a Thomas Ingram back in 1689 so it looks like a familiar family connection.) Then in 1866 an Abraham Bitchenor who is the son of another William in that line, has a son called Abraham who marries Sophia Fields, who is part of the Musgrove family.
I will send you an email so you can send on what you have and we can send you the William family tree. If this all pans out, and some of the detail my cousin and I are providing here would seem to substantiate it, then you're right, it's indeed an exciting day with more to come!