The photo is here for reference:
https://forums.ootpdevelopments.com/...1&d=1631470573
The front row looks to be (left to right): Herman Long, Jim Conway, Joe Gunson, Bill Watkins, Jim Manning, John Sowders, Billy Hamilton. Matches were given previously.
The back row I think should get an overhaul from what was proposed. From left to right: Jim Burns (5' 7"), Dan Stearns (6' 1"), Billy Alvord (5' 10"), Unknown 1, Unknown 2. The player I think is Stearns was originally proposed as John McCarty, but he was gone from the club before the photo was taken. Unknown 1 and Unknown 2 I think are Park Swartzel and Jim Donahue.
9/23/2021: After some offline discussion, the consensus seems to be that Donahue is Unknown 1 and Swartzel is Unknown 2
Here is Stearns, compared to the second player in the back row. The center photo is an Old Judge card from spring 1888. The right photo is from an 1887 cabinet of the Topeka Giants.