N566 Newsboy Pugilists and their variations

[G1911]

I don't want to present myself as any kind of expert of here, but it seems all previous efforts have amounted to 'there are different variations and several factors' and left it there. I'd like to dive a little deeper here and document them all, as I'm doing for pretty much all the 1887-1912 stuff. This is thus, like usual, both a request for help either publicly or privately showing other examples and a data dump of some of my research for anyone who isn't bored of this stuff yet.

I'm going to take it one card at a time so as to not dump 20 images into one post. Basic checklist:

Group 1:
#23 J.J. Corbett (portrait 1)
#72 J.J. Corbett (fighting pose, less common is portrait 1's photo)
#73 Peter Jackson (2 slightly different fighting poses)

Group 2 (301-390):
#347 J.J. Corbett (portrait 2, green type)

Group 3:
#966 Bob Fitzsimmons
#1068 John L. Sullivan (fighting pose)

Other ? [DEBUNKED]
Composite Checklist w/ Sullivan portrait

The group 1 cards are more commonly found than the other groups, in and out of boxing. Within that group some cards are less common. I don't believe this set is really as complex as it is sometimes made out to be and that every 'possible' version actually exists in each group - some differences are linked together rather than generally found on every version. I am also confident there is much I do not know (hint hint!)