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I guess that blows the Sakumo theory out.
1 out of 3 evidences explained.
All 3 are explainable.
Kakashi's sense of smell is greater than most, but he's not the only non-Inuzuka to have this ability.
Hiruzen had a great enough sense of smell to track Hashirama and Tobirama, which got him around Kokuangyo:
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And no, there's no certain requirements for any animal summonings that we saw in the series, to my recollection anyway. All you have to do is sign your name in blood in the summoning scroll.
Not much telling where Kakashi was given the scroll from. It's a possibility his father had a contract with the ninken as well, and he passed it down to Kakashi himself(I believe Kakashi was 6 when his father killed his self, and he was chunin at 6 as well, so he would have had the skill/chakra to summon), or the summoning contract with the ninken was something kept in the Hatake-clan, and he was given it given he would have been the heir to it, I assume.