These are huge losses. Pachocki led pre-training for GPT-4, and probably GPT-5. Brockman is the major engineer responsible for the efficiency improvements that enabled ChatGPT and GPT-4 to be even remotely cost-effective. That is a piece that is often overlooked, but OpenAI's advantage over the competition in compute efficiency is probably even larger than the model itself.
https://time.com/collection/time100-ai/6309033/greg-brockman...
It would be my life's dream to spend 80 hours per week coding without having to communicate with others... but no one is an island...
You really have to have a passion for coding to put in the hours and be very good at it. Incredibly rare, believe it or not. Lots of people think they are good coders but this is another level. Proof is in your commit/code review count/async comms being 10x-100x of everyone else in your org, and it's clear you're single-handedly enabling delivery of major projects earlier than anyone else could. Think of the pressure of doing this continuously.
1) Moves fast, flexes their authority to sweep small stuff under the rug until it is out of scope and can be "fixed real quick" later. Often leverages many subject matter experts through effective and persistent communication and learns quick enough to get PRs through the door (that sometimes need "quick" fixes later). Enjoys selecting items that benefit their career the most, at the expense of others on their team. Mentors only enough to onboard and increase his team's yield, not to aid their careers. Fueled by the recognition and validation of peers through PR/project completion.
2) Gets shit done, is the SMI themself. Solo code cannon, but PRs go in clean, beautiful to look at. May not get along well with some but not necessarily abrasive to work with especially being part of their direct team. Can be a great altruistic mentor if they spare 5% of their time. Enjoys what they do, and the technologies they work with. Fueled by personal satisfaction in their achievements, and in uplifting their team.