That'll do the trick
As the voting stands at the moment, for those who Zwift and picked a number:

2.5 - 3.0W/kg covers 60%
2.25 - 3.25W/kg covers 76%

So it looks like you could probably accommodate 76% reasonably well if you have 2 leaders and it should definitely work with 3 leaders. Don't forget that due to drafting, like in real life the faster guys can sit on the front or hang off the back for a harder ride while anyone who expects to struggle and wants to minimise their power requirements can try and stay in the middle of the pack. To allow that, the leaders should call for a re-group at the top of climbs. The intensity typically rises on climbs and the draft influence is minimal so the bunch often gets scattered. Also best to make sure the ride isn't restricted to TT bikes as when you ride those the draft simulation is turned off.

By the way watts are "W" not "w" ;p