Shouldn't Future Trunks be able to handle Black and Zamasu, to the timeline he's going to, by now?

[Angelus]

Beerus can't kill an immortal anyways that's why Whis said he had something better than than mafuba jar. Couldn't Whis just bring Future Trunks to wherever Black or Zamasu is in that timeline? Future Trunks should be able to handle it right?

[SsjCookie]

You mean Trunks going back into the past and catching Zamasu with the mafuba jar again before he killed the whole earth population?
Wouldn't he be creating another time ring if he did that? (this arc is really confusing)
Beerus created a different timeline by killing Zamasu before he was immortal already so he's been sent to that one.(i think )