I personally wouldn't be comfortable with 14 individual bonds that are all BBB rated (in this scenario). I agree with your logic that you ought to be sensitive to the overall quality of the portfolio since 14 issuers is still a pretty limited number, thus you'll probably want at least several A__ grade bonds in the mix.
But you are saying that you don't need all 14 to be A__? What if the number goes down form 14? When would you suggest just to put all in MBH and forget about individual bonds?
