Also: if company has 'standard' vesting documents & has taken outside funding, is the lawyer who set those up still a trusted neutral resource for both founders

Also: if company has 'standard' vesting documents & has taken outside funding, is the lawyer who set those up still a trusted neutral resource for both founders? Even in their role as "company's lawyer", they could talk to you both about how the existing agreements affect the resignation, firing, or mutually-agreed exit of a founder, and discuss ideas that help the company survive & thrive past that event. Though, to actually negotiate (& legally execute) a durable exit agreement, you'd likely want a separate lawyer on your side. (And, given the values implied by the outside investor's price-paid, & your estimation of future revenues, spending a few $thousand here could save $tens-of-thousands or more later.)