But, the editing room is where the movie is made. And Joss has control over the editing right?
But how is he going to
edit in jokes that aren't there
in the footage (or whatever it is people are afraid of)?
Say he makes his scenes that he's shooting
exactly like scenes from one of his own films... he's only shooting material that may comprise of 10% of the movie. That 10% is sure gonna clash with the 90% that Snyder shot, wouldn't it?
Unless people think Joss has a hidden agenda to derail the film (and his reputation, thereby), it is in his BEST interests to make the film work all together as a whole. Having a disjointed film that jumps around in tone is not a good idea for the film, for him or for his reputation.
Now, if someone found proof that he was actually shooting material to completely
replace existing scenes that Snyder had already filmed entirely? Yeah, that could point toward a radical shift for JL. But he's doing the reshoots that
every major film has these days--material that will support and enhance the film. Had Snyder not had to walk away from it, he would have directed the reshoots. What Whedon's doing right now was
going to happen anyway. The reshoots are not happening because Whedon wanted to alter the film.
Joss had already been working on the film
with Snyder--so the film was already going to have more of his stamp on it.
The most basic fact is this: WB wants JL to be more successful than BvS was (despite what it grossed, people forget that studios only make about half of the box office gross--so BvS
barely turned them a profit). Movie studios have
always only cared about money. So if WB feels that making their movies more like Marvel will make them more money, then they
will do it.
The
general audience didn't like BvS the way many of its fans did--and the general audience is where the money for every movie really comes from. Not diehard fans. Bringing on Whedon was a step done to better court the general audience. So say what you will about Whedon's involvement, but anything he does was
already set in motion and isn't being done
now in the reshoots.
tl;dr--the film is going to be exactly the way it was if Snyder had not walked away, with the exception of Elfman being composer. But still, he has to match the footage.