Hi
Looking at the names in the entries, I wasn't sure that it was Hester, also a slight difference to the surname. I have found their marrriage in the parish records and it is a lot clearer to read.
Marriage at St Mary & St Lawrence, Great Waltham
Thomas Gipson (bachelor) & Easter Waldon (spinster) both of the parish were married by banns on 23 June 1770, both made their mark.
These are their earliest children - no sign of a John
Baptisms at St Mary & St Lawrence, Great Waltham
Anne, daug of Thomas & Easter Gibson, May 26 1771
Sarah, daug of Thomas & Easter Gibson, Aug 14 1773
Thomas, son of Thomas & Easter Gibson, July 30 1775
William, son of Thomas & Easter Gibson, April 16 1777
Joshua, son of Thomas & Easter Gibson, July 18 1779
Kevin
Just had a look in the marriage records again.
Found a marriage for Joshua Gipson in 1803, one of the witnesses was William Gipson - so I think that confirms the surname (incorrect spelling for baptism entries)
Also found the 1804 marriage for John Gibson, all surnames are clear, so it would seem that John was not related to the Gipsons, it does say that he was of the parish at the time of marriage however that doesn't necessarily mean that he was born there.