This is the bit I'm a bit unsure of in the way Zwift does their draft effect - it almost feels like the whole group gets a speed boost including the guy in front I have been solo chasing to re-catch a group a few times and my w/kg have been way higher than the leader of the group and I still can't catch up. IRL you only have to go a little quicker than the guy in front to catch up with the group - doesn't seem so in Zwift?
Bridgy, that is exactly my point. I think the reason breaks don't stay away is that the big group goes faster than they should based on the power of the rider at the front of the group. The extra speed is generated by the number of riders not the power of the lead rider(s).