The size of the net pot does not determine the size of a plant. I had 3" net pots and plants with 2" diameter stocks.
Those plants are gonna suck the fuck out of the 2 gallons and the ph will change in a flash when they get bigger. To fix this problem, hook the 2 gallon bucket to a 40 gallon reservoir. Then train the plants outwards so they don't fight for the light.
Or you could just transplant each one to it's own 5 gallon bucket when they start to kick out root.