[Grammar] 「わりになって」

Hello there again guys,

I've been practicing my japanese comprehension lately by reading mangas, right now I'm focusing in the (classic) Captain Tsubasa.

Last night I got into a sentence whose meaning i managed to get with some ease, but as a matter of improving my comprehension over its grammar as a whole, I got stuck in the following expression.

1-"本当に奇跡だったわ、車にはねられた瞬間も。。。どうろ にたたきつけられたときも"
2-"サッカーボールがクッションがわりになってかすりきず一つつくらなかったんだから、翼は"

These sentences refer to the previous fact that Tsubasa was hit by a car

I'm stuck in the bolded part , "wari ni natte", right now I comprehend that "wari ni" expresses something unexpected, but, by adding "naru(te form)" after it, I can (in a sloppy way) comprehend the sentence, but not in a satisfactory way.

My sloppy translation of the second sentence( suggestions and corrections are welcome):

"Because of the ball's cushion, tsubasa managed to not get a single scratch"
The "wari ni natte" for me surely doesnt get its way into the translation because I guess its meant to add surprise or the feeling that no one expected such a "miracle" because of a mere cushion, am I right? wrong? Any help is hugely appreciated~

Not クッション / が / わり / に / なって but クッション / がわり（＝ 代わり） / に / なって

かわり【代わり】の英語・英訳 - 和英辞書 - goo辞書

Rendaku - Wikipedia, the free encyclopedia

It's not わりになって, it's サッカーボール代わりになって.

…の代わりになるもの、…の代用になるもの
がわり【代（わ）り／替（わ）り】の意味 - 国語辞書 - goo辞書

[Edit] Really? I was behind by two minutes?

Now, that was both embarassing and enlightening, Thank you guys, really , I'm really grateful

I would never think of such a thing, in the end it was a matter of "instead/kawari ni" not "surprisingly/wari ni"
Thank you guys, I dont want to be rude or something, but since i provided my translation, I really wish one of you would give me your view on the sentence, I mean... may you translate it for me? Comparing my attempts to the more skilled ones often helps me improve not only my english(not a native here), but my japanese too

Whoops, it was クッション代わりに, not サッカーボール代わりに. Anyway...

サッカーボールがクッションがわりになってかすりきず一つつくらなかったんだから、翼は。
The soccer ball acted as a cushion, so Tsubasa only ended up without a graze.

[Edit] Whoops. Thanks for pointing that out, Toritoribe.

かすりきず一つつくらなかった
without any graze