Don't overly concern yourself with what is currently in there. It's likely to have been in there awhile and is broken down. I prefer the method of taking off the rear cover. As someone said, you really get a chance to look things over inside and see if you have any large bits of metal in the case.
Make sure you use the proper hydro filter and not just an oil filter, there is supposed to be a check valve inside. Also make sure to take a rag and really clean out the case. Might use a dowel rod to help get to the back of the case where it gets tight.
One last tip, I used a pump spray nozzle and shot new fluid up to the back of the case while it was still open and over the drain pan. That pushed out some more dirty fluid.
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