Reply To: Mnemonic device to remember Joseph, Jacob, and Isaac

Joseph: Last but not least.

Hashem created the plants and animals first in order to prepare the space for man to enter. Afterward, before Shabbos, he created man.

Now you can say that Abraham and Yaakov are very different than plants and animals. True. Maybe being Yosef is symbolic of the additional spiritual elements embodied and passed on to the generations.