Yeah I think it’s pretty good
I haven’t really seen any credible evidence that makes me think that more than 1 person was involved. All the actual hard evidence points to Berkowitz and Berkowitz only.
Usually the people that believe more than one shooter was involved point to the differing sketches but sketches have been known to be WILDLY inaccurate. A lot of times people put way too much stock into them. They aren’t pictures.
Now that’s not to say they aren’t ever right or helpful but you can find tons of cases where the actual perpetrator and his sketch look nothing alike.