The comments are so off that I don’t know if you are being serious or doing a low quality sarcasm? Nash twitter following someone doesn’t mean anything - most of the times is just to give visibility to followers for people that want to be active in twitter. Either way I will address your fear here because others could be reading.
We are happy David is not in Nash anymore, we don’t get sorry when someone leave Nash - we celebrate it. I hope he goes on to have higher positions and maybe found his own startup. Before David several others have left Nash, we are still growing so more people has joined than left.
There is no “core developer” in Nash, there team members and founders. In the specific case of David he had just started to learn how to code, if not mistaken was his first or second year as a frontend dev, when he first contributed in COZ. He was a great fit as a contributor to Neon wallet - naturally he was invited to join as a early team member in Nash, as a Jr. frontend. Now as times passes Nash like any startup is maturing, workload is high and payout in stake is lower, so David decided it was time for him to move on - and when that happens is better for both company and team member. I hope that Nash helped he learn and become a better developer so he can continue to grow in his career.
Regarding the absurd Gavin, Ethereum, Polkadot fud. Gavin was a founder, creator of the EVM. And on Nash every team member signs a NDA with non-compete clause, so no David nor any of the several ex-team members of Nash can start a competitor or use Nash IP.