I really aren't very confident about this one!! S. J. Cathie was the Leopold secretary in 1901, he left the position in 1903 ("after many years of hard work"). George Cathie (Leopold/Melbourne) and Sylvester John Cathie are almost certainly brothers, I'd say. Surely it's very unlikely S J Cathie would have been playing for Richmond (1900-03) while being so involved with Leopold? He probably had to retire from playing a few years earlier than that (more correctly matching what it says in his army record).
Incidentally, Leopold FC (in 1900 at least) had Port Melbourne Cricket Ground as it's headquarters, so that may explain why Vess Cathie had a connection with Port Melbourne CC.
Yeah, the absence of any solid connection seems to be the indication that I'm trying to force him into Richmond's timeline. And it's just not working.
I might have to go back to the drawing board on who Jack Cathie is.
I suspect one of our earlier researchers (say 10-15years ago) checked BDM and found Sylvester John fitted in birth-wise into Jack Cathie's Richmond debut date, and populated the first name field with that.
So, at the moment I am removing Sylvester John Cathie as Richmond's Jack Cathie from my confirmed VFA and WAR list