There are far too many characters introduced this arc to use again in any serious way. Trying is how you end up with a mediocre show like bleach.
Bleach's issue wasn't the size of the cast, it was the fact the writer added a new character whenever he got stuck on anything.
No idea how to get Ichigo out of this jam? Instead of coming up with something clever he'd come up with a new character to fix the issue. This led to insane and unmanageable bloat given the scope of the story was centered on a single town. DBS is a universe spanning series, it wouldn't have that issue.
If they want DBS to be a really long running show, something they'll keep around for decades, having a big cast would be way better. Even if they don't all get used right away it creates options for later arcs that don't require creating new characters whole-cloth and ensures the audience cares about the characters in that arc.
EDIT: There's a few characters we've been introduced to that would definitely be worth keeping around long-term and expanding upon. If that's not the whole point of this arc, introducing a bunch of characters and seeing which ones work out the best, then this entire thing is a wasted moment.