Plyos have many benefits of course, however its relation according to the F/T curve sill shows that it is not specific to max speend in regards to the ground contact.
Plyometric anad I mean the true form of plyometric as in a depth jump should have a gct in the range of .2s where as an average sprinter at Max V will have a gct around .1s.
Although they appear close, in terms of the force output they are still very far apart.
As star61 mentioned, EFE, FEF drills. flying runs and other Max V drills will be much closer in GCT versus the training elements like plyos or bounding. But they all have the place