generally, the higher rank means youre the better player but let's say we're rank 5 and beat a team rank 6, but the rank 7 people beat the team rank 3. we may stay 'in the same spot' but rank 7 may move up to rank 5, us down to 6, 6 down to 7, and maybe the rank 3 down to 4 or something.
also there are multiple divisions within each league. so diamond league may have 10 divisions(100 spots per ldivision, 1000 players) so being ranked 6 doesnt mean we are the 6th best team, but it means more like we're in the top 6% of players. but also there are many more divisions per league in the lower tiers. there are 5 leagues, so maybe 40% of players are in copper, 30% are in silver, 20% in diamond, 10% in platinum, and 5% in diamond. (i know thats 105% but just as an example go with it.) so if we're in the top 6% of the top 5% of players... we prolly just pro. (and in the top 1% of players)
but for the record, we could lose a couple and be pushed down far. and idk if we're really as good as the game says we are. we should go to korea and find out.