First: let me say that you English is great! I see no issues 

Second: I'll pint to the fact that Severus gives Albus the cold shoulder for basically all of this fic. He's only in a handful of scenes. Moreover, you have to remember that Albus is a political force onto himself. I don't think there is much that Severus could do to him if he wanted. And also, Severus doesn't want to get rid of Albus. He's too important in terms of keeping Hogwarts safe. He might never trust the man around Harry or the rest of his family ever again, but Albus is still important to Hogwarts. So it's a 'grin and bare it' sort of situation.

I'm not sure which original chaacter youre refering to, but thanks!

Would recommend you read the first one. There are details that will become more important once the series moves on.

-TTC