There's a problem here, but it's not with the engine-- if you choose to hire a PC as your FC you get what you deserve (in fact, the engine HAS to work this way to assure that players don't steal an advantage by naming PCs as FCs without fielding penalty). However, this was almost certainly an auto-hire, and the game should be corrected to prevent this type of auto-hire, for two reasons:
1) In the real world, even if you were being cheap, you would be able to tell the difference between a crappy FC and a crappy PC to hire as your FC. The sim's auto-hiring a guy with a 40 or even 30 glove rating is potentially realistic; hiring one with a 9 glove rating isn't.
2) This may be an abandonment, and it just kills the abandoned franchise for the next, potentially dedicated owner to have this happen to this organization. Hiring a crappy rookie league PC as the FC is not good for the game.
Coach hiring is probably better now than it ever has been, but it still needs some help.