Anyone ever run 2 plants in a 5 gallon?

I would grow my plants using the French Espalier method of pruning once I got to the third generation of cloning. This would essentially allow you to grow 4 plants in a 5 gallon bucket ( bubble bucket) and reduce the amount of plants in flower. For me I would do 3 buckets with 3 plants with a reservoir bucket totalling the vegetative mass of 12 plants. But, I did SCROG. The yields were worthy but it took a little longer for training.