Excellent post Jeremy!
Davids-11 has already been set as the final WikiTree ID. I'll leave Davids-11 as is for now, but let me know if y'all decide to go with Davis instead. Generally, if you have a reliable birth or christening record, that's the spelling/stying of the name that should be used. However, I also support using the name that the person used himself/herself over most of their lifetime. comment on bullet one: So your first bulleted question is "spot on" :D
comment on bullet two: Short version: I think in this case, since Davids came about because of the Dutch version Davits, that Davis as LNAB might be more appropriate. Long (really long) version: I agree that "Davits" isn't really appropriate as his LNAB and those profiles can be merged into Davids-11, which should have Davits added to the "Other last name(s)" field and an explanation in the bio section. It's also prudent to not merge away Davis yet. (Each merge results in a "redirect" that can cause problems when you get a string of them - see here for details). Background: If all duplicate profiles NOT Davis go directly into Davids-11 and all Davis duplicates go directly into the lowest-numbered Davis profile, that's only one redirect for each profile. If Davids-11 and Davis are then merged, that's two, and not really a problem.
For duplicates of Kit that you believe will be merged into Davids-11 after review, add the "Merge Compare" template at the top of their profiles - {{New Netherland Merge Compare|signature=~~~~}} and set them as an unmerged match so that they're easily found but don't get default approval to be merged in 30 days (which proposing a merge would do).
comment on bullet three: WikiTree guidelines recommend in this situation: Davis as LNAB; Davids as Current last name; Davits as Other last name(s). However, I usually see that folks prefer to go with the more recognizable (used during his or her lifetime) last name for the WikiTree ID, which is based on the LNAB field, and include the birth name that the person really didn't use as an Other last name. This is where discussion among descendants can sway the guideline slightly toward the latter - Davids - as LNAB, or not (going instead with Davis as LNAB). I don't feel strongly one way or another, so long as both names are included in a name field - LNAB, Current, or Other - and an explanation is in the biography section. Speaking of which, I see that Davids-11 doesn't seem to have been edited post-merges. Let me know if you'd like me to do a "first wash" edit & I will.
Thanks for asking, and making it to the end of this overlong comment! 