Of course they’ll grow bigger in their final pot, I was referring to the fact if you transplant them from a small pot to a bigger pot before or at the very beginning of flower they will get a good bit larger compared to keeping them in the same smaller pot.
Of course if you go from a small to larger pot they will get bigger.
I'm saying take, lets say, 7 gallon pots. Start one in the 7 gallon and start one in a small cup or pot and step it up as time goes by. Veg them the same amount of time. When you hit flower the one in the final pot will be bigger. Probably finish bigger as well.
I moved away from one or two plants at a time. I run a mini perpetual now. I start them in solo cups and then move to a ine gallon grow bag and then transplant to about 3 gallon pot right before flower.
Either way works depending on what the goal is.
With autos I prefer to plant straight to final pot. Its possible to transplant them but I figure why risk it. Especially if one follows the guide of transplanting at 7 days. The cup isn't full of roots by then and its easy to damage the roots if you let the soil fall apart.
At one time or another I've done about everything that's not supposed to be done with cannabis.
I've even topped autos. Most handle it just fine and a lot of them will yield more from it.