No, yes, and yes. I guess in the case of the second two, I know that from doing stuff around town or traveling elsewhere. I don't go with commando relatives or friends on trips, unless it's agreed upon ahead of time that we can split up for part of the time- mostly because I am not a rope drop or hike at dawn kind of person.
My approach is more like- if we have time to use those fast passes, great, if not, reschedule. If we have time to make that ADR, great, if we don't feel up to it, CS is also good. I really have no problem splitting up, either. But I realize not everyone travels like that.
But I also think you're talking about something different. You're talking about planning and knowing the speed you can move at as a group. The gist of the message I was commenting on is that the OP should get everyone to increase their endurance- get them to walk miles at home on a regular basis. Or at least that's how I read it. That's what I was referring to as training and I think that's ridiculous. If you're tired in the parks, take a break. It's vacation, not a marathon that one must train for. Just because I can get up at 5 am for work and then run a mile after work does not mean I want to get up that early to get everyone ready for rope drop and then run that mile on the hotel treadmill at night.