I'm not sure if this is supposed to happen Mr beanie but, I decided to accept a Midway Gato on the 29th November 1942 and all I was given with it was a basic loadout of a .50 Cal, 3" Deck Gun, SD Radar and no SJ Radar.
I installed a 20 mm AA Machine Gun, a 4" Deck Gun, SJ Radar, and Improved SD Radar.
No problems encountered so far after 5 patrols.