Content specialists and campaign specialists should manage workstreams separately but work closely together.
Campaign specialists thinks about the LPs - what goes into what fold, decisions like gated vs non gated, the demand journey, distribution channels, dollar split between paid channels.
Content specialists should think about the consumable asset itself (video/whitepaper, ebook), and all the copy that will lead people to consume it. (LP content, paid search copy, banner ads copy, social posts, sociable, newsletter, promo video etc.) Some times, there would be specialised content specialists working on Long form content vs snappy promotional
Copy.
For organic content that will be useful in ranking, content specialists may have seo expertise or collaborate with experts who can give them the right inputs on keywords.
Approach might be different for smaller companies, with doublehatting, but scale requires specialisation.