Premise:
"There was a chance that most of one hemisphere might retain some measure of warmth, then."
Hypothesis: Most of one hemisphere might retain some kind of warmth.

yes

Premise:
"yeah they end up juggling the lineup and trying to fit uh more inexperienced players into those roles and they just don't have the leadership don't have the skills to carry a team"
Hypothesis: They have the good leadership and skills needed to run a team.

no

Premise:
"I once studied to be a doctor. "
Hypothesis: I've never studied medicine in any form.
no