Firstly, USDT is not controlled by Tron nor Justin those most USDT user like to make use of the TRC20 since most crypto exchange site supported but other scalable blockchain network like SOL, Avax, EOS etc also supported USDT though some exchange site are yet to support those chain for USDT transaction. However, I believe Tron will be in good hand though I dont clearly understand Justin stance about quitting Tron but I believe he just leave the title of CEO to someone else but hes still part of the Tron project.
Correct but people think Justin Sun controls all like what they believe that if satoshi comes back, satoshi can control all development of Bitcoin. It is not because Bitcoin protocol must reach to consensus for any upgrade. Same for many other blockchains and TRON too.
Reaching a consensus state before any upgrade in the cryptocurrency realm is only valid in decentralized crypto, yes Tron is decentralized and also an open-source crypto project.
Years ago, Litecoin founders sold out all of his Litecoin to get rid of his impact on Litecoin price. It is another variant to eliminate impact of founders on price but a bit different than what was done by satoshi.
Charlie Lee, Justin Sun are well known founders, not anonymous like satoshi so they have to do different approaches.
Charlie publicly announce the selling of all his LTC holding is what affect the LTC market till now because we have a lot of investors which dont have much understand about the crypto market. However, if Charlie want to eliminate the impact of himselve in the LTC market he shouldn't have sell all his holding because people believe his an act of rug pull.
He should have sell some portion just like Elon did with his Tesla holding.