[Research Math] Comparing World Energy ( recruits ) needed for training camps = s2-1-10 vs s1-7-7 and Random color vs same color [more Math, some more Math, Math Apocalypse]

Trying this as a separate reply for linking purposes ( like a book chapter ):

Extra low cost (1*/ 2* for 2 recruits) gives you the best value for your recruits by a long shot. Leveling 5* 1.1 to 5* 4.80 takes:

9823 recruits and 3.1 million food using common training,
5456 recruits and 2.1 million food using uncommon training, but
only 2182 recruits and 1.1 million food using extra low cost training.

Since I am running three camps at extra low cost training, it only takes 40 minutes to train a hero versus 30 minutes for uncommon training but I get x2.5 XP for leveling heroes.

This is on purpose, Small Giant games created Empires in less than a year after their critically acclaimed game failed badly at monetization. So many early options are significantly sub optimal.

==Excerpt from above for easy reading on mobile==