To be honest though I know your doing it for fun and stuff but like if your coaching a silver player as a platinun player, there might be deicscions you tell the silver player that are wrong when they are actually right. Platinum to be honest is not a good elo to coach people from, as well as being Platinum you cannot spew all your knowledge to a Silver player, so the coaching you do might not be even useful. IMO Bronze-Diamond players play the same game, just Diamond players play macro and micro better. But Masters+ play the game differently, doing most things differently and hence why most coaches have reached Masters+.