How many plants to keep in a 4x2

I mean if you are already at this point with 4 plants (3 containers - am I seeing that right?) then I would not throw any of them out. If that is one container/ 2 plants you may have some root issues between the two plants. I’ve run lots of beds SoG style but seems whenever I go round bags the roots fight with each other. That said at the very least you can run those two other plants side by side. Will speed things up for you vs running one and training it out into the same canopy footprint as 2 plants. If you are in 4 containers with 4 plants then I would say go that route with the same logic as above. You will fill your 4x2 edge to edge faster with more plants then any single plant can fill it thru veg. Good luck