I can figure could happen pretty much only in a lower level league where you could have guys that only play a season or less and stop, and there are not so many players on the server so bots fill out the league, the most I have had inactive + bots in a league was level 3. (Almost half!!) But since it has steadily been more active than not, and I have made in-game friends on my server that are very active, so I see them in league sometimes and CL or Cup.