Siuan states that despite being less than half her original strength her healing ability had not changed at all. Aviendha and Flinn both struggle with Traveling. Nynaeve cannot make a Ter'angreal. Rand has almost no healing ability.

Conversely, Ishamael is stunned by the WF's ability with weather ... Unless you think he's only talking about Talaan this is an example where clearly weaker Channelers have created OP effects far greater than expected. They only needed to link in order to use the BotW and what they did with that was also clearly well beyond what the FS thought should be possible. This speaks to both exceptional Talent and exceptional skill. Go ahead and say it was strength that made the difference there, I'm sure Rand will rush out, grab a couple of weak angreal and form a quick circle and beat the DO