Of all the options this sissy chooses a regular human that looks most japanese.
You could blame MC, but i will cast my judging eye toward the author who made MC this way.
So he decided to absorb only one monster per day cause doing so is somewhat painful? What kind of a sissy is he, didn't he wanted to catch up with his friend?
With the death of many men, the thread of prophecy is severed. He can't restore a saved game to restore the weave of fate, so he'll persist in the doomed world he has created.
To be honest the dragon didn't have wings so it's not surprising that MC mistook it for a lizard.
Unlike MC's in other isekais this one's understandable.