Need help understanding forensic data (USDT and TRX)

I have a bunch of spreadsheets worth of transactions between a number of wallets. I've been reading quite a bit but I think it's time to ask for help. My understanding is that every USDT transfer between wallets also needs a small amount of TRX to be paid (the gas fee, if I'm not mistaken). I would imagine that if Wallet A sends USDT to Wallet B, then the TRX ought to come from Wallet A as well. What I'm seeing is somewhat different. Let me use an example: 5/10/24 10:00:00 - Wallet A sends 5000

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