What does だけ replace here?


> 髪形だけ父さんに似せてもお前は跡取りになれない

Real son says that to adopted son.

だけ + ～ても confuses me. Does だけ replace は/が or を? If は/が, it would be "Even if
only your hairstyle makes you look like dad [...]"/"Even if your hairstyle is
enough to make you look like dad [...]" and it would make sense, but if を, it
would be "Even if you make only your hairstyle look like dad (dad's hairstyle)
[...]" and "only" would make it weird, given the rest of the sentence.




In this case, it's を that was replaced by だけ. 似せる is a transitive verb used
like this:

> お前は髪型 **を** 父さん **に** 似せた。
>
> You made your hairstyle resemble Dad's.

You can change を to だけ:

> お前は髪型だけ父さんに似せた。
>
> You made only your hairstyle resemble Dad's.

Thus:

> 髪形だけ父さんに似せてもお前は跡取りになれない。
>
> Even if you make only your hairstyle resemble Dad's, you can't become the
> heir.  
>  → Copying only Dad's hairstyle won't make you the heir (i.e., you differ
> too much from Dad in other aspects).




In this case, it's を that was replaced by だけ. 似せる is a transitive verb used
like this:

> お前は髪型 **を** 父さん **に** 似せた。
>
> You made your hairstyle resemble Dad's.

You can change を to だけ:

> お前は髪型だけ父さんに似せた。
>
> You made only your hairstyle resemble Dad's.

Thus:

> 髪形だけ父さんに似せてもお前は跡取りになれない。
>
> Even if you make only your hairstyle resemble Dad's, you can't become the
> heir.  
>  → Copying only Dad's hairstyle won't make you the heir (i.e., you differ
> too much from Dad in other aspects).

