N2 — outside your level filter
のことだから
knowing X as we do; since it's X — a prediction grounded in a known party's character
あの人のことだから、また忘れてるんじゃない？
ano hito no koto da kara, mata wasureteru n ja nai?
Knowing him, he's probably forgotten again, don't you think? casual
時間に厳しい田中さんのことだから、もう着いているでしょう。
jikan ni kibishii tanaka-san no koto da kara, mou tsuite iru deshou.
Tanaka being the stickler for time that he is, he'll have arrived already. neutral