$co_author = Array
(
    [ID] => 311
    [user_firstname] => David
    [user_lastname] => Jones
    [nickname] => David Jones
    [user_nicename] => david-jones
    [display_name] => David Jones
    [user_email] => david.c.jones@accenture.com
    [user_url] => 
    [user_registered] => 2021-09-24 18:19:23
    [user_description] => 
    [user_avatar] => 
)

 $co_author = Array
(
    [ID] => 269
    [user_firstname] => John
    [user_lastname] => Newlin
    [nickname] => John.K.Newlin
    [user_nicename] => john-k-newlin
    [display_name] => John Newlin
    [user_email] => John.K.Newlin@accenture.com
    [user_url] => 
    [user_registered] => 2021-01-11 17:24:00
    [user_description] => 
    [user_avatar] => 
)