TBH, that makes me think that it's even less likely that the OP hired a lawyer.
After all, no-one rushes out to hire four separate lawyers to examine a contract. And if you paid for one lawyer to fully investigate the situation, why would you then seek out three other lawyers afterwards? If you decided that the lawyer you hired was crap and their opinion worthless, you might hire another one. But their opinion was the same as the first lawyer, so by this point you'd be insane to hire any more lawyers.
So it's much more likely that he informally asked some friends and contacts. While these people may well have been lawyers, they probably were just offering a quick, rough opinion on the matter. If a lawyer was actually hired, they would spend some time fully understanding the situation, and the next step to take would then be acting on their advice, not seeking out further legal advice to muddy the waters.
So what if he asked friends/associates who are lawyers for a quick feedback, or even paid the lawyers for limited amount of time? When a lawyer gives you a quick assessment and it's "This is very risky," how likely is it a more thorough review of the contract will be more positive?
Considering DJI's position at that point was "this is a final offer" how useful would it be to shell out a considerable amount of money for a more thorough review?
After all, no-one rushes out to hire four separate lawyers to examine a contract. And if you paid for one lawyer to fully investigate the situation, why would you then seek out three other lawyers afterwards? If you decided that the lawyer you hired was crap and their opinion worthless, you might hire another one. But their opinion was the same as the first lawyer, so by this point you'd be insane to hire any more lawyers.
So it's much more likely that he informally asked some friends and contacts. While these people may well have been lawyers, they probably were just offering a quick, rough opinion on the matter. If a lawyer was actually hired, they would spend some time fully understanding the situation, and the next step to take would then be acting on their advice, not seeking out further legal advice to muddy the waters.