I can't show you any verse of scripture which states in this way; 'Putting I before somebody elses name implies equality with them.' However something in John 10:30 is an affirmation of the Son's deity, which is why they picked up stones later on to kill him. It can't be the use of the word 'one' in the neuter (hen) as the apostles are also 'One' (hen) with both the fathe and the Son which would make them Yahweh as well. So the ball is in your court, if The Son is Yahweh God according to John 10:30 where on earth in this verse do you see any such claim to deity, it's certainly there, and you need to find it if you believe it. In Jewish idiomatic thought to put your name before that of another person implied equality with them, so that's my take on why the Son is Yahweh at John 10:30, if you understand jewish idioms, you'll see the deity of the Son at John 10:30 just as clearly as i do.