It has always been the plan and will likely get Brandon reelected. Kennedy is actually hated by the left, and most democrat voters. They all think he is a "crazy conspiracy theorist" etc. He will pull center right (fake libertarian) votes more than anything else.
https://www.breitbart.com/politics/2023/09/29/report-robert-f-kennedy-jr-to-exit-democrat-primary-run-as-independent/