relays are a funny ol' game... dropped batons, poor handovers, teams DQ'd at heats etc etc...and so its not unreasonable to speculate its not all about the speed of the top nations.
Yes Maz would be a strong candidate; clearly has the endurance to go that "extra" bit, and has demonstrated time and time again that she can take it out over the first lap.
And it all starts in the heats - where the mission is to make sure we are not stranded out in lanes 7/8.
My argument for the 2nd leg is that we have to remain in contention... if we are not, its pointless stacking legs 3 and 4 with CO and PSD.
That's why I would put CO in the 2nd leg, and her brief is to run smart. If on the day the USA are 15 metres away and increasing, OK - accept it. Your mission then, CO, and you will accept it, is then to make sure you bring down any gap to silver/bronze - steadily - so that at change over 2/3 we are less that 5m from the medal.
If for some reason, some twist of fate, when CO receives the baton and she is in a group of 3/4 at the front, she tucks in and looses no ground, but, again being slightly contentious, there is no gain for the team to have her then try to get a lead, having leg 3 dangle out front is pointless...
Leg 3 - simple brief no more than 5m behind medal (what ever colour)... do or die.
PSD is a chaser, on the flat, get her within 5m of a medal at the handover; hear the crowd roar, the goosebumps raise, screaming at inanimate TVs across the country, and by-golly, I'll be crying like a baby if its bronze!!
Sure, its easy on paper ...