big states, small states, early states I believe are the 3 sets.
Um, I believe you're talking about the Ohio Plan, which is deader than dead. The only change the RNC is making to the calendar is trying to push the whole thing a month later, with IA, NH, NV, and SC voting in February, and everyone else voting in March-June. But there's no longer any effort to organize the other 46 states into groups voting on the same day. That'd be left to the individual states to work out.
In fact, the push start things a month later will itself probably fail, because many states will violate the rule, and the RNC won't sanction them harshly enough to change their behavior.