You'll need some sort of trellis or ScrOG screen to tie them to. The only function of the hydroton in the netpot is to keep the roots from twisting and/or tearing and to stabilize the plant.
Could you show us a photo of your 5gal buckets? I don't understand what the base of the plant would look like with out a net pot, how is the plants weight supported?
Ok I'm not usually one to call someone out on something... but I call bullshit, Style. A 20 zip plant in a 2" net pot? Wouldn't the stem alone be close to 2 inches? Is it just me or wouldn't that be like putting a dog collar on a puppy and never adjusting it as they got bigger? Pictures or it didn't happen.
I know I haven't been here long.. NY.. but the proof is in the puddin.
http://www.youtube.com/watch?v=l_7OsUrzDtQ&p=170E777A521B9265