Might not fit your narrative, sorry in advance...
Recruiting isn't linear. Pacing is a poor way of looking at it; it is a convenient mental model, but doesn't map well here.
Nebraska signed 4 of those four star players on or within a week of their signing day (Greene, Francois, Fleming, Brown), maybe there are more, I stopped looking. The big fish wait to sign, that's the name of the game... if you're not patient, following recruiting is going to be rough.
Edit: Lol should have refreshed the page, what Decked said.