Doesn't matter if the pacemakers are rotating when the actual sub 2 trio can't stay with them.
It's going to be psychologically difficult to try and run your half marathon pb (59:25) twice. I bet he didn't end that thinking he wished he could do it all over again.
https://www.theguardian.com/sport/2017/may/04/nike-monza-marathon-eliud-kipchoge
Which suggests pacemakers will be rotated.