As far as I know, Mt Gox is selling its BTC’s so that it could manipulate the market, make it crash and then again buy at lower rates which will skyrocket the price again therefore gaining significant profit and increasing its holding in BTC more. Tron won’t dump much for now, am sure about it as there is net test, main net launch and coin burn coming on 31st march, so I guess insiders will want to hold it too. I agree that USDT cannot be trusted because we don’t know by what institutions or banks or firms it is backed up by.