I'd certainly bring it up to the bank manager and have the clerk explain it.

Other than that, leave him be. So what if he has a bad credit score.

I'd check it out with others to make sure that YOU don't get the bad score but let him sink or swim as he wishes.

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01 Ford Excursion Powerstroke
99 E300 Turbodiesel
91 Vette with 383 motor
05 Polaris Sportsman 800 EFI
06 Polaris Sportsman 500 EFI
03 SeaDoo GTX SC Red
03 SeaDoo GTX SC Yellow
04 Tailgator 21 ft Toy Hauler
11 Harley Davidson 883 SuperLow