Ah, you moved from correlation means causation to... what? Trying to ridicule me without bases?
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Mind you, probably the slugs are not a part of the group of life forms that need a contract. Still doesn't mean Sakura couldn't have just learned to summon slugs just before the war.
Regarding assumptions? I know I'm speculating, the problem is that you are speculating too and still trying to pass it as a valid argument that everyone should take for granted.
I've seen the word "logic" being spitted (in every circumstance and regarding any type of discussion) here enough to understand how it rolls.
Not even in my Artificial Intelligence class I heard the word logic used as often as it is used here.
I've been in forums about subjects and media with more depth than Naruto and the word logic isn't used as often as it is used here.
I could keep going but I think I've made my point.