I can tell you without a doubt that pot size can effect growth, sexing, and overall length of cycle. I know for a fact that the Root System is primarily responsible for kicking your plants into flowering with Autos. Mephisto transplants, and I do too. You can do it a couple different ways. I believe Mitch let's his go until they show sex, then transplants. I use smaller cups to start seedlings often, they get transplanted around 7-10 days. Basically whatever you try with Autos, the first 2 weeks of the plants life can drastically effect the entire growth cycle. Overwatering will slow root development, which in return slows plant growth and delays sexing. I am very experienced, but ANYONE can add a little tootoo m moisture a little too early and delay things. Perfect example, I have 2 CDLC seedlings. One remained a tad wetter in my little cups, they are on about day 11 or so. I transplanted them 2 days ago. I could see the roots system was better on the one VS the other. It is visibly bigger on top already too.
Adding air injection to your medium will speed up root growth and flowering. I will post a thread up in a day or 2 about my CDLC seedlings. The SMALLER one was given an Airdome on purpose. I want to show people how much the Airdome speeds things up. I can put money on it that once I turn on the Airdome that the smaller plant will take over within a few days.