Looks like I missed that improved critical damage also improve damage that's listed on the damage. I didn't know that before.
I modified the question to ask how various factors lead to how damage is actually computed.
What do you think?
I see. I've read that. The reason why I think my question will add value is because many people want to have 70k damage too, and the screenshot pretty much proof that it can be done. Not available on that other questions.
Also answers on that other questions "may be" wrong. For example, somebody said, attack speed actually improve hydra.