So let's try this again...how likely is Newk to improve his command?
Here is a list For single seasons, From 1997 to 2017, Age at or above 24, From 1st season to 2nd season, For any choice in Season Totals, (requiring GS >= 10 and BBp9 >= 5), as well as their resultant career BB/9 rate:
Aaron Harang 2.8
Brandon Webb 3
Eric Gagne 3.2
Joe Nathan 3.4
Aaron Heilman 3.7
Joaquin Benoit 3.7
Octavio Dotel 3.9
Doug Davis 4.1
Angel Guzman 4.2
Daisuke Matsuzaka 4.4
Joel Hanrahan 4.4
Paul Rigdon 4.4
Justin Miller 4.5
Scott Eyre 4.6
Micah Bowie 4.7
Russ Ortiz 4.7
Ryan Glynn 4.7
Jesus Sanchez 4.8
Blake Snell 5
Randy Keisler 5
Scott Williamson 5
Sean Newcomb 5.1
Victor Zambrano 5.1
Blake Stein 5.3
J.D. Durbin 5.3
Seth McClung 5.3
Tony Saunders 5.3
Kazuhisa Ishii 5.6
Radhames Liz 5.9
Andy Larkin 6.4
Of those 30 names, 7 got their career BB/9 under 4.0 (23%). You will be hard pressed to find a legit SP with a walk rate above 4.0.
Only 4 of those 30 (13%) got their career BB/9 to 3.5 or less, which is about where a good SP needs to be.
Any way you slice it, it is not likely Newk "figures it out".
I find it interesting the Top 4 guys on this list are pretty much the best 4 players on it.