I hope you've done the newly weds some justice. If not, it's also not your fault anyway. I'm sorry if I have crossed you, but I just feel sad that couples are doing this nowadays.
Back to the discussion, yes, the main photog won't have time to guide the ones tagging along. May be a few tips here and there during rest time, but most of the time, he will be very busy with the shooting.
If TS wants to tag along, better know your basics. If not, no point even giving you tips, as you won't know what the main photog is talking about!