I agree with you though, character power is important. But what I'm saying is that the argument "character A cant be that strong they haven't won a major" isnt a valid excuse for discounting someone being over the top. That's all I mean. That's why I said in my post that character strength, once past a certain point, is irrelevant. Ie, the character(s) have to have a certain level of power to be competitive, but beyond that, at the highest levels, its the players. Unless a character is just so out and out broken that they negate this.. We see all the time when a strong player takes a 'decent' character well into a top 16, or 8, and in some cases even wins with them.. but by the logic I am expressly trying to refute, that would mean they would be stronger/better than all the characters they beat.
There are exceptions - we see this when a character just has a shitty MU vs another character and one character's tools just negate another's in such a way that skill isn't sufficient to close the gap.
Using the Alex scenario.. Infil wouldn't have won with him necessarily because he's below the power threshold. At the highest levels of competition, when two equally skilled players meet, character strength is not heavily relevant assuming both characters are competitively viable and you arent looking at a bad MU scenario.. and even then, we routinely see extremely strong players piloting low and mid tier characters through other extremely strong players who are using the more stratified members of the top tier.
Have to leave for work. Will add more later.