Of the 18 skaters (not counting two goaltenders) that teams may dress for a regular-season game, at least 13 must be qualified as "development players." Of those 13, 12 must have played in 260 or fewer professional games (including AHL, NHL, IHL and European elite leagues), and one must have played in 320 or fewer professional games. All calculations for development status are based on regular-season totals as of the start of the season.
ahl uses games instead of ages. I really don't know if it makes much of a difference. The only real advantage of using games is that a player dealing with injury problems will not hinder the team's ability to keep letting him try because of this rule
How long until we see a Krasnodar developed player of quality?
not soon, the sample should be FC Krasnodar, for the most part interesting team, with a private ownership, gather talented youth from all over Russia, but the team is young ( I would say 7-9 y.o.). They do stuff right, sign talented players, great scouting and almost don't take part in fixed matches. Only a home loss to government backed KS comes to mind, they were probably forced into it by the PFL.