Question: Which is considered a gin cocktail, Shrub or Old Etonian?

Context articles: Eton Boating Song
Old Etonians F.C.
Moyra Fraser
Old Tom gin
Old Etonian (cocktail)
Henry Blofeld
Fallen Angel (cocktail)
Gimlet (cocktail)
Shrub (drink)
Arthur Augustus Tilley

The "Eton Boating Song" is the best known of the school songs associated with Eton College that are sung at the end of year concert and on other important occasions.
 It is also played during the procession of boats.
 The words of the song were written by William Johnson Cory, an influential Master at the school.
 The melody was composed by an Old Etonian and former pupil of Cory, Captain Algernon Drummond and transcribed by T. L. Mitchell-Innes.
 The piano accompaniment was written by Evelyn Wodehouse.
 It was first performed on 4 June 1863.
 Ordinarily, only the first, sixth, seventh and eighth stanzas are sung.
 Contrary to popular belief, the "Eton Boating Song" is not the school song of Eton College, that being "Carmen Etonense".
The Old Etonian Association Football Club is an English football club whose players are alumni of Eton College, in Eton, Berkshire.
Moyra Fraser (3 December 1923 – 13 December 2009) was an Australian-born English actress and ballet dancer, who is best known for playing Penny Johnson in the long-running sitcom "As Time Goes By".
 Her sister was the actress Shelagh Fraser.
 She married author Douglas Sutherland, with whom she had a daughter, and Old Etonian Roger Lubbock, by whom she had two sons.
Old Tom Gin (or Tom Gin or Old Tom) is a gin recipe popular in 18th-century England.
 In modern times, it became rare but has experienced a resurgence in the "Craft Cocktail" movement.
 It is slightly sweeter than London Dry, but slightly drier than the Dutch Jenever, thus is sometimes called "the missing link".
An Old Etonian is a gin cocktail which enjoyed great popularity in London, circa 1925.
 The cocktail takes its name from Eton College and from the college's alumni, who are often referred to as Old Etonians.
 The Garden Hotel in London is an example of an establishment that had mastered the Old Etonian cocktail during that era.
Henry Calthorpe Blofeld, {'1': ", '2': ", '3': ", '4': "} (born 23 September 1939) nicknamed Blowers by Brian Johnston, is a retired English sports journalist, broadcaster and amateur ornithologist best known as a cricket commentator for "Test Match Special" on BBC Radio 4 and BBC Radio 5 Live Sports Extra.
 He has established a reputation as a commentator with an accent, vocabulary and syntax that is quintessentially Old Etonian both in style and substance.
 He also writes on cricket and has authored eight books to date.
The Fallen Angel is a gin cocktail.
The gimlet (pronounced with a hard 'g') is a cocktail made of gin and lime juice.
 A 1928 description of the drink was: "gin, a spot of lime, and soda".
 The description in the 1953 Raymond Chandler novel "The Long Goodbye" stated that "a real gimlet is half gin and half Rose's lime juice and nothing else".
 This is in line with the proportions suggested by "The Savoy Cocktail Book" (1930) which specifies one half Plymouth Gin and one half Rose's Lime Juice Cordial.
 However, modern tastes are less sweet, and generally provide for at least two parts gin to one part of the lime and other non alcoholic elements (see recipes below).
In terms of mixed drinks, shrub is the name of two different, but related, acidulated beverages.
 One type of shrub is a fruit liqueur that was popular in 17th and 18th century England, typically made with rum or brandy mixed with sugar and the juice or rinds of citrus fruit.
Arthur Augustus Tilley (1 December 1851 – 4 December 1942) was an academic of the University of Cambridge.
 An Old Etonian, his first subject at Cambridge was Classics, after which he began a career as a barrister.
 He returned to his old college to teach Classics, going on to specialise in French literature and becoming both a literary critic and a historian.