It is certainly possible. That's why it is important to consider all available information, examine the situation from various perspectives in order to make an informed decision and come to a conclusion.

Here's another piece of information that proves the accounts are related, and in my opinion, most likely alt accounts:

TX1:
From: 0x0984274936f54ab6d34b6e4c1a8aaa92416e5cfe (ltcrstrbrt)
To: 0x4320379558e74800b37114848e7905695c33624a (bluedeep)

TX2:
From: 0x0984274936f54ab6d34b6e4c1a8aaa92416e5cfe (ltcrstrbrt)
To: 0x4320379558e74800b37114848e7905695c33624a (bluedeep)

TX3:
From: 0x4320379558e74800b37114848e7905695c33624a (bluedeep)
To: 0x0984274936f54ab6d34b6e4c1a8aaa92416e5cfe (ltcrstrbrt)


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).