I would expect you to question the way I see it in the following observations
Of course...and you might, if you had actually examined it rather than simply accepting the intended implications from a blindly-faithful Baha'i perspective, also have expected me to start with this...
Have you seen this Genealogy Chart?
Genealogy of Shoghi Effendi
Yes I have - and if you trace the Davidic line backwards from Baha'u'llah to Jeconiah - that's about 1800 CE to about 600 BCE or 2400 years - there are only 11 or 12 named descendants of David between them whereas there should have been at least 70 or 80 generations - IOW there are somewhere between about 50 to 60 missing generations (at least). Not terribly convincing - and add to that, there is no supporting evidence even for the ones that are mentioned - I doubt any but the three or four immediately prior to Baha'u'llah are attested to in any independently verifiable records. Prior to Jeconiah, the record depends entirely on the scriptural tradition of the Jews and Christians, which, as Adrian has very recently reminded us (for the umpteenth time), was already corrupted and in dire need of correction by the time of Muhammad - hence the need for his appearance - partly, it seems, to provide a correction to the false assumptions of Judaism and Christianity in regard to the coming of the Messiah in David's line.
So basically, that genealogical chart is a load of old rubbish - based, as it mostly is in the davidic lineage part - on an outdated and apparently corrupted version of an incorrectly transmitted revelation that was superseded 1400 years ago and yet which faithful Baha'is still want to invoke as proof of Baha'u'llah's status.
You have to ask yourself - how weak is the case if we have to clutch at straws like this?
PS - if you work backwards, knowing that you have 2 parents, 4 grandparents, 8 great-great grandparents and so on...and make a reasonable allowance for marriages of relatively close cousins, by the time you go back about thirty (or even fewer) generations the number of your direct ancestors exceeds the entire population of the world. If you think about that, what this means - in Baha'u'llah's case, if King David really existed and if his genetic line survived, almost everyone in the entire world - and especially in the middle east - would be descended from him at some point in their family tree. So even if were true, it is nothing special. No more special than it is for me to know that there is an 80% possibility that I am descended from King Edward III.