As with Litecoin, this will not have a major impact on the entire XRP community, but XRP owners will feel like they have been betrayed, because when selling XRP, the co-founder has lost a bit of confidence belief & motivation to work.
XRP is having a tough time when the low price & intensity is inferior to BTC & ETH. PlusToken is also holding large amounts of XRP, which will be a real threat to XRP's future. Is this reason why this co-founder must sell the amount of XRP he owns.