Dude, I hope you know that 2 characters will start with 4km range.
Range will be enough because the characters that will start at a distance of 4km, in order for funny's passive to work, zeref must have a bad kill type emotion against him, but zeref can use his haxes because he does not have an opposite emotion against fv and he does not need to have a killing emotion to defeat him, zeref can activate death manip by thinking of Natsu or Mavis, so that none of the passives of fv will be active and the battle will end directly at that moment.
Zeref also has dimension travel and thanks to this
Zeref can rewind time so that he can get rid of the bfr, there is nothing wrong with that, and because zeref rewinds time, he gets rid of the bfr
I think I explained that he can't bfr.
Even if Zeref gets caught by love train's bfr ability, because my character has dimensional travel hax, even if he gets caught by the bfr hax, he can get rid of it because he can get out of that bfr dimension and go back to the place where they fought.
No need for range dude, it won't be active anyway and stop throwing that emoji, it's so offensive.
I personally think I'm responding to your statement "He doesn't need to beat him, he just needs to BFR, and if he does that Zeref won't come back." and I think I'm saying that Zeref won.
Dimension travel is already in your profile, man...