cart and wagons are two different things. But even if it did that would not overcome the fact that every witness to the effect including LTT/Rand acknowledges that gateway size is directly linked to strength. More importantly, either EVERY weave is based on Talent or "Talent" indicates something that is abnormal. Like I mentioned most "Talents" are about modulating a weave and most weaves have a specific effect that will happen when you reach the power level. If there are variations in that effect it is due to a person's strength in a power or to a Talent. The more basic the weave the more the weave is dependent upon the channelers OP strength and their strength in the power of the element being used.

What I said above in a different post is that because Gateways are made of only Spirit and Spirit is the power people are equally "strong" in, that the variation in sizes will correspond directly to the channelers strength. Similar to how people strong in Earth are required to effectively make heartstone. Strength in Earth varies from person to person, Spirit does not. Because "strength" in Spirit is equal a stronger channeler will be stronger in Spirit. But being able to modify it beyond that would require a Talent for manipulating that specific weave.