Cait has no burst. Other ADC's with more burst will benefit more from Blitz CC'ing the other champs. Cait's advantage is her range.
Please for the love of God stop thinking a certain champ/lane is good just because you win with it once.
Please for the love of God, keep the attitude at bay for a start, would you?
Secondly, I said it because it happened nearly *every time* I was Blitz + Cait combo, not just because I've won it once or twice. I just wanted to share that based on the confusion I had of why its generally thought to be a "not so good combo", when I've had very few bad experiences with it.