I don't know why but I feel like you're all being mean to Sakura for some reason >.<. I don't blame you guys for seeing Sakura as weak. The one thing I didn't like about Tsubasa was how weak Sakura's portrayed. Look at some of the pictures, or even some of the scenes. Syaoran would always be the one protecting her! His arms would always be around her, or put in a stance to protect her, while Sakura puts on a face of 'damsel in distress'.
Now compare this to CCS. Sakura, although weak as she is, found her strength in other people. She was strong, because she had love and support and that's exactly what I'm hoping for from Sakura in Tsubasa. She can be strong... just give her some time.
If they were to have switched places, yes, Sakura might have a break down but I'm sure her love for Syaoran will push her on. And I don't think she'd be that afraid of Kurogane and Fye. Knowing Sakura, she'll find her way into their hearts and vice-versa. They might be able to give the support that she needs...