The "Key Point" to remember is that this Game was designed to allow Players to send Infantry and Vehicles into Battle and that the use of Heroes, Starship Strikes, and Mercenaries were / are considered "support" and expected to be used in limited fashion.
This is why we have long cook times for Heroes, Starship Strikes, and Mercenaries and shorter cook times for Infantry and Vehicles.
So that said, the chance of any Second Cantina or Mercenary Shorter Cook Times is like finding a Snowball on the dusty plains of Tatooine...
Just a historical point of view for those whom never had the benefit of the Game Developers direct contact / chat.
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