Twin Tilter Twirler

The Deaths in 2017 site lists under July 23, 22, 21, 20:

• John Albert Kundla (July 3, 1916 – July 23, 2017) 
• Robert Alonzo "Bob" DeMoss (January 27, 1927 – July 23, 2017) 
• Mervyn Gordon Rose  (23 January 1930 – 23 July 2017)
• Thomas Norman Lister (27 October 1943 − 22 July 2017
• Jacques Nahum (27 February 1921 – 21 July 2017)  
• Jonathan Seth Shurberg (March 27, 1963 – July 20, 2017 
• Artem or Artyom Mikhaylovich Tarasov (July 4, 1950 — July 22, 2017) 

What to make of the clusters.  Most dramatic being the "January 15(x2), _, 19, 21, 23(x2), _, 27/date Sequence" pattern-cluster... given the  birthdays of my Son and Life Partner on January 15; the birthday of my brother January 19, the birthday of my daughter January 21, the birthday of my grandson January 23, and then the two birthdays above re Bob DeMoss and Marvin Rose.   And then we have a "July _, 3, 4(3), _/Date Sequence" pattern cluster, note from this posts header:

On July 4th, 3 Of the first "5" US Presidents had died: Jefferson "5" hours before Adams, and Monroe "5" years later on the "55th" Independence Day

As for Thomas Norman Lister , we have a cryptic "twin north man tilter".

list (v.1) "to tilt, lean," 

And we have a "October 27, _, _, January 27,  February 27, March 27/ 27th Day, Month Sequence" pattern-cluster.

So to investigate the gaps... using the formula ...