Have only just come across this thread.

Here is where were are at with the alts of quickseller mentioned in the OP:

24 November 2013, 17:18:43 Date Registered:    opossum      925

14 July 2014, 10:45:33 Date Registered:    Sempruls   87
20 July 2014, 12:09:48 Date Registered:    fonenumba   412
21 July 2014, 01:34:31 Date Registered:    BTCreward 611
21 July 2014, 02:49:02 Date Registered:    needFREElunch   273
21 July 2014, 03:28:25 Date Registered:    applesRyummy    128
21 July 2014, 13:25:28 Date Registered:    screwUdriver   346
21 July 2014, 15:22:40 Date Registered:    Rum152      147
22 July 2014, 15:51:40 Date Registered:    quickseller

02 February 2015, 17:47:39 OP thread begins.

27 February 2015, 07:15:34 Last Active:    Sempruls

11 March 2015, 05:15:42 Last actual post    applesRyummy
quickseller posts: (15 March 2015, 01:31:27 part of the overall post) talking about the UID BTCreward having been sold.

22 April 2015, 07:02:02 2nd Last actual post    Rum152 - last post 05 September 2015, 21:04:32

11 July 2015, 04:13:13 Last actual post    needFREElunch

05 September 2015, 21:04:32 Last actual post    Rum152 - 2nd last post 22 April 2015, 07:02:02

26 October 2015, 18:49:15 Last Active:       Rum152

27 May 2016, 08:35:57 Last Active:       needFREElunch

14 March 2017, 22:47:02 Last Active:       opossum

10 August 2017, 13:42:25 Last Active:       applesRyummy

2018-04-20 5:11:38 AM    password changed   screwUdriver

02 July 2018, 01:20:39 Last actual post    screwUdriver
09 July 2018, 18:40:07 Last Active:       screwUdriver
20 July 2018, 18:52:21 Last actual post    fonenumba
2018-06-21 9:08:22 AM    password changed    screwUdriver
28 July 2018, 02:51:47 Last Active:       fonenumba

2018-09-08 2:34:46 AM    password reset via email    Quickseller
2018-10-19 5:45:54 AM    Changed to Archived status    Autoban user   screwUdriver (BPIP)

18 March 2019, 09:52:17    BTCreward stops posting online in English - does not post again until 04 September 2019, 00:21:25

04 September 2019, 00:21:25   BTCreward resumes posting (entirely in Russian) - has not posted since 18 March 2019, 09:52:17
2019-09-04 12:46:28 AM    Changed to Archived status    Autoban user   fonenumba (BPIP)

22 September 2019, 11:10:02 3rd Last actual post    Quickseller
01 October 2019, 13:06:17 2nd Last actual post    Quickseller
07 October 2019, 05:33:02 Last Active:    BTCreward
20 October 2019, 16:15:40 Last Active:       Quickseller

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quickseller posts: (15 March 2015, 01:31:27 part of the overall post) talking about the UID BTCreward


16 July 2014, 04:34:45 Date Registered:    superSTAR777
07 September 2014, 02:52:24 Date Registered:    Babba D

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As you can see, it would appear that quickseller is still in control of the above alts with the possible exception of screwUdriver and fonenumba which quickseller probably sold as a package and the buyer then got those accounts autobanned through their previous activities.

Sometimes you have to wait a little bit for the information to reveal itself.