Key person risk around scientists?

Was considering buying some shares in Chrysos before the recent run up but held off due to uncertainty about a few things, including key person risk. The annual report discloses how much is paid to the board and senior executives, but as far as I could see, it doesn't mention Dr James Tickner. Isn't he the key guy running the science and ongoing development of same? If so, I would normally consider him to be one of the most important, if not the most important person within the business. What is locking him in and keeping him motivated to do his level best? How does his remuneration compare to the other senior execs...how many shares does he own?
Does anyone have information as to how Dr Tickner and his team are incentivised and locked in?

My other question is around scalability...how are Chrysos going to get to scale without raising more equity or borrowing a huge amount of capital? The valuation requires high growth but if they can only fund say 20 machines per annum, then it's going to take a long time to get to any kind of highly profitable scale...what am I missing? Open to all ideas, not a basher, I just want to learn more about the business and their relative strengths and weaknesses before I commit capital.
Many thanks to all.