[arctic82]

It all depends on how much conditioning you get from your sport training. Also you should note that weight training while naturally used for strength and power gains also should help you to avoid imbalances in your body that might lead you to injury.

So I think that the priority for a fighter should naturally be sport training, injury prevention and diet.
After that comes assistance training which should be oriented on improving weaknesses. Also a good athlete valuates constantly his progress and weaknesses and changes his goals accordingly to suit the new needs.

So I think that yoga and swimming are good for injury prevention, recovery and general conditioning. As a fight nears you should switch to more demanding and more sport specific conditioning.

This as a simplistic generalisation.