I’m sorry to hear your grow guru passed before you could share your harvest with him. Sounds like you two had a solid friendship and that’s always sad to lose, although having known many people with cancer there’s always an element of relief that they’re no longer in pain or suffering as it can get pretty brutal at the end.
To answer your question, when I’m growing from seed I always harvest the plants individually depending on when they’re done as you’ll see a range of finishing times depending on the differences between one seed and the next. Same goes for different varieties, I usually polycrop (ie have many different varieties flowering at once) and again harvest as the different plants are ready. For commercial cash cropping harvesting all at once is important so you can fill the room and start over but as a personal home grower it makes more sense to me to harvest the plants individually as they finish to the best quality possible.