It would indicate a vibration issue and/or an alignment issue. You used to see that on some late model Bertrams, several re-aligns on the motors, till they figured out the stringers were not structurally sound. I would take a hard look at everything, considering the paint on the engine mount nuts.
I am assuming this comment about "picking it up after the shot" is in regards to the aquafina bottle? He might have a hard time picking it up as it is zip-tied to the motor. With an overflow hose in the neck. Someone put that bottle there to capture any coolant being discharged from the coolant header tank overflow hose. Better than having it go in the bilge, yes? Fiji water is a better choice, though.