Daxx,
You are spot on with the 1st explanation. You can have 9-9 and 9-8 rounds heck you can even have 7-7 rounds if it came to that.
10 Must system is your starting base meaning both fighters start off with 10-10 points that's why when they say I have that an even round it's scored 10-10 round.
From 10-10 you deduct 1 point to the person who lost the round then you also deduct a point if he is ruled knocked down.

Theres no need in re-explaining it if someone doesn't get then they just don't get it and should look into it.