Brian refers to Brian Chesky, CEO of Airbnb. "Crawl up my sleeve" appears to be a misphrasing of "roll up my sleeves" meaning to do hands-on work.
Hire executives who know how to execute. Let's say Sanchan's entire team disappears, and then I go to Brian and say, 'Hey, Brian, I got to hire this organization, I got to hire these people, and then I'll tell you what to build.' Now I should be able to then crawl up my sleeve and do exactly what my team did.