Surgeon know's best, that said I broke my collarbone back in 09. Options were to plate it, use a new method whereby they use a long screw (and remove it afterwards) or to let in heal naturally. I went for the screw option, aside form it being less invasive surgery the surgeon had worries that long term, with either a plate or a screw it would create weak points either side of the metal. Probably worth mentioning to your specialist as a potential reason to remove the plate. Yes it will mean a longer recovery period, however it's the end result that matters!! I guess thats still no concrete testing on whether leaving a plate in is best, or removing it. No doubt in a sport such as this it really comes back to what difference ity will make once the same kind of impact occurs. I'd imagine breaking it again (with a plate in) could be a hell of a mess to fix. Good luck either way