Sentence 1: The man was not large, perhaps as tall as Ca'daan himself.

Sentence 2: The man was not large, perhaps only 6 feet taller than Ca'daan himself.
Is this second sentence entailed by the first?

Answer: no

Sentence 1: Dave made no protest.

Sentence 2: Dave didn't protest.
Is this second sentence entailed by the first?

Answer: yes

Sentence 1: Then you know where she is?

Sentence 2: Then you have been in touch with her?
Is this second sentence entailed by the first?

Answer:
it is not possible to tell