true that NT coach can play a roll. That said I don7t think a 4000k salary rookie with high potential should just be retired because their owner cheated/went bot.
Are you trying to say NT coach doesn't know which teams are going to bot in such populous BB country as Japan? Then try to solve this by election first I guess. Like there are competitive games for most of the countries that time of the season and you don't have two NT teams to solve that.
I understand that it could happen someone firing a solid prospect too quickly but you can prepare for bot teams.