I think you misunderstood or misquoted me. I suggest 1 smaller plant, but only b/c you have a small tent and blooming plants can easily double in mass. In my experience, there's 2 types of indoor growers, SOG or SCROG. SOG people veg many plants for short periods and send them all to bloom. SCROG people try to achieve the same results with 1 or few plants. SCROG also implies the use of a screeen which I personally only used once, but the rest of the technique is generally the same. I aim to get the most out of the least head count. I have 3 blooms, each about 4x4x8. I framed the rooms myself and used panda film walls, much like the old video George Cervantis did many years ago in his mockup. IMO, in your 2x2x6, you'll only get 10 ounces if you're lucky, and then it will take a few rounds with the same strain to feel out how much veg time you'll need to efficiently fill her out in bloom, but not to the point of over growing the tent too much which you'll find to be very easy to do. You want to achieve good air flow around every part of your buds, and if buds are pressed up against each other, they will sweat onto each other and cause mold. However, maintaining good circulation will prove to be difficult in your small space. You might want to invest in several smaller fans, oscillating if possible. Once your plant stuffs up that tent, the dimensions of the tent will be challenged, and it will be difficult to move things around. If I were you, I'd have a few fans down low aiming up into the canopy and an extraction fan up high that connects to a carbon filter.
I started in a similar sized space years ago and I think it was my first 420 journal.