Thank you for the reply and the point of question.
I agree 100% that we will not see and built the complete puzzle, as that is life.
I like your metephor and I would see that is the current state of the complete puzzle, that all the pieces are still widely scattered, many yet to be found and assembled.
I draw my thoughts from this passage, which is about the tradition of the 27 letters of knowledge, which only 2 letters had been released up to 1844. In 1844 the remaining 25 letters (or all the puzzle) were released. (The Message of the Bab). A link if interested and an extract behind my thoughts. Brackets in quote are mine.
bahai9.com
".......Thus it is related in the "Biháru'l-Anvár," the "'Avalim," and the "Yanbú'" of Sádiq, son of Muhammad, that he spoke these words: "Knowledge is twenty and seven letters. All that the Prophets have revealed are two letters thereof. No man thus far hath known more than these two letters. But when the Qá'im shall arise, He will cause the remaining twenty and five letters to be made manifest." Consider; He hath declared Knowledge to consist of twenty and seven letters, and regarded all the Prophets, from Adam even unto the "Seal," (Muhammad) as Expounders of only two letters thereof and of having been sent down with these two letters. He also saith that the Qá'im will reveal all the remaining twenty and five letters. Behold from this utterance how great and lofty is His station! His rank excelleth that of all the Prophets, and His Revelation...."
The purpose of the Bab was like John the Baptist, it was to prepare the way for the promissed one, the "One God would Make Manifest", which the Bab gave in his writings as Baha'u'llah.
Regards Tony