In my experience, the ones that pop super quick like this use up their energy too fast. They never get past this stage. The leaves become fully formed in the shell but never push through.
Not technically. It's just like when a woman gets pregnant. She doesn't change to look like the father. The fruit will always look like the plant it is grown on, the seeds will carry the changes.
That main stem looks awesome. I love how all the little sprouts are growing underneath also.