I'm sure his gameplan was to standup. Seeing what Cain's done to guys on the ground before and the fact that Junior should have had a significant standup advantage is probably why he did stand up every time.
Not to mention, JDS was in survival mode most of the time. He reverted to what he trained to do... which was standup if taken down.
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Jon Jones / Mark Hunt / Cub Swanson / Dustin Poirier / Darrell Montague