@dm
You're looking at this the wrong way. It's not about why Crown wouldn't give RSUs to employees transitioning to EQT or Zayo; it's about what a "retention incentive" actually means.
Calling the remaining 2/3 of already earned RSUs a "retention incentive" is misleading. These employees performed work this year with the expectation of receiving a certain amount of their compensation in RSUs. Now, instead of getting those RSUs as planned, the company is simply changing the label on money they've already earned.
A true retention incentive would be new, additional compensation offered specifically to encourage employees to stay through the sale. What Crown is doing is just fulfilling a prior compensation promise, albeit under a new, deceptive name for part of it. The 100% vesting at close is a baseline expectation, not a generous incentive, especially when it's for compensation already earned.