That is a failed acquihire. The whole point of an acquihire from the acquirer's point of view is that while business-unit-specific OPEX budget is used for salaries, bonuses and other overhead, retention packages and equity arrangements are generally covered by the central budget. Otherwise you would just hire people directly, possibly using special packages.

What an acquihire gets you, as an executive, is that people you otherwise wouldn't be able to hire, because you can pay above market without wrecking your budget. These people are either vesting out equity or they are on explicit retention packages, but from a budget standpoint _they aren't on you_.

Another way to think about it is that this buys you the time necessary to, using the normal levers available to you, get employees to the point where a set of overlapping RSU grants are vesting quarterly, thereby both avoiding a steep compensation cliff and getting the total compensation to where it needs to be in a way you could not do on day one.