That's not necessarily the case. You might not want to put up money to cover taxes, but that's not advantageous in all situations, so echoing everyone else's advice here: talk in depth with a professional who's time you pay for.

I'd rather pay the taxes directly than trust someone else to do it, especially when that someone is making it as difficult to get the money from your investment. Those RSU's were earned, and the whole point is you get to share in the liquidity event.

Huh? Who's trusting some other party to pay your taxes? I'm saying keep the RSUs, pay for the taxes out of pocket, so you hold onto RSUs that may appreciate faster than, say, holding onto SP500, likes say picking up FB at 30.