hmm.... tough one...

one thing if you wait until Chopper gets to you is that Ryleigh might not associate HER coming to the reward as it´s so retarded from her action....

and one thing doing it first is it may cause status conflicts... but then again it may not considering Chopper´s attitude in taking his time..

you can try finding what makes his eyes brighter treat-wise or toy-wise so he´ll run like flash to you...