Because a 5* sig level goes up to 200 whereas a 4* sig only goes up to 100.
That being said, the dev team has been incredibly inconsistent on this. For instance, a 5* Hyperion has a large increase in his sig at the same level as his 4* counterpart, and the sig is much stronger at the max ability. Other champions like Hawkeye has their abilities nerfed as a 5*.
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That being said, the dev team has been incredibly inconsistent on this. For instance, a 5* Hyperion has a large increase in his sig at the same level as his 4* counterpart, and the sig is much stronger at the max ability. Other champions like Hawkeye has their abilities nerfed as a 5*.