Of course these address are related, that's a public information! Thanks to Blockchain
"I'm not asking you how many BitcoinTalk users do you know personally." take a conclusion!
Everyone can send tokens to everyone especially when these people are relatives, friends, fellow.. etc. don't you have such transactions made over the time?
If you search deep enough you'll find more transaction between me and some Bitcointalk members ( actually some of them losing the contact with crypto world for various reasons).
It is not a problem and anyone can make transactions with anyone's address but your account is in question and arising more questions from time to time starting with asking non-collateral loan. And till now running using the same wallet. How co-incident it is that you and all of your relatives/friends coming back on the forum at the same time.