As said the title;
Is it possible to know if two or more addresses are related to one wallet? and if from transactions i can figure possible connection (same wallet) between addresses.
I post this here because i think it's a beginner question, no?
No one should be able to see if you are the owner of the addresses in the same wallet, as long as you don't mix output from those addresses with each other. And as long as the bitcoin didn't come from the same addresses before they ended in the addresses you have them in now.
I would not be surprised to see that some of those addresses with 10,000 bitcoins are to be found in the same wallet. But as long as the owner doesn't mix the coins no one but the owner of the wallet will ever know.
https://bitinfocharts.com/top-100-richest-bitcoin-addresses.html