To Repot or Not?

[mjsdas]

I just received this Cattleya orchid from a grower in Hawaii. I was expecting a medium size plant but as you can see from the attached photos, the plant appears to be very mature. The roots are so dense, you can barely see any potting medium. It is presently in a pot which is 5" x 5". The plant seems to be very healthy but I noticed that a couple roots in the very bottom of the pot appear to be rotted. I have not tried to removed the plant from the pot yet because it may be difficult to get it out. I'm new to growing this type of orchid, so before doing anything I'm seeking advice on whether it should be repotted or not. If so, when is the best time to repot a Cattleya? How big a pot should it be put into? Should I consider deviding the plant at the time it is repotted? There are no flower buds right now but I want to be careful not to shock the plant because the grower indicated that it tends to bloom in the spring. Any other helpful information and/or suggestions would be greatly appreciated.