i think it can co-exists.
my psych doc has me down as autism, and mood disorder nos. even though i disagree with the mood disorder nos. its still on my list of diagnosis's .

another one of my roomates had Aspergers with bipolar having severe mood swings.

but also reaction to outside stimulus and things my be misunderstood as mood swings, just like meltdowns can be misunderstood for tantrums.