If Billy is the client, would we really need Paladin? Billy could just walk up to Vision and start explaining what's going on. Unless Billy is having similar confusing flashbacks about Vision like Tommy is having. Although Agatha could help clarify that, so probably not.

If we need Vision alive then perhaps it's not just Vision they are after, but also the AIs inside. Ultron could be a useful ally, maybe outside Ultron looking for inside Ultron? Or an Ultron cult of some kind looking for Ultron? Also possibly someone looking for Edith? She got a special introduction and she's in charge of weapons plus maybe still some Stark tech?