Cross-promotion is a normal agency play. A good agency lines up creators whose audiences overlap just enough to reinforce a message without wasting reach, sets a shared hook and staggers posts so momentum builds. The planning work is matching the right creators and timing, not the mechanics of posting.
Whether agencies can coordinate several creators in a cross-promotion so the campaign reinforces itself.
The craft in a cross-promotion is selection and sequencing. You want creators who share a theme but not an identical audience, since total overlap just pays twice for the same eyes. An agency maps that, agrees one core idea each creator expresses in their own voice and orders the posts so later ones ride the first wave. The quiet risk is inflated audiences, because one bot-heavy creator drags the whole chain. Vet each creator's follower quality before you build the sequence. Flinque lets you compare creators across four platforms with audience overlap in mind and a fake-follower score on each, free at /find-influencers/.