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Speed Index is probably not the perfect answer, but the key is that SS needs more 0-60 than top speed. The key to Wilson, and probably Gutierrez, is the fact that they reach their top speeds very quickly. Their top might be slow, but they can get into 6th gear real fast.
Hannahan is a 3B with low speed index. Though it's not perfect, at first glance, you're not going to assume he's quick.