Bible study is about developing convictions unto godly edification. But one cannot develop convictions based upon things which are largely speculative. Rather things which are highly speculative invite vain disputes as there may be little substance to say anything for certain.
In contrast to that notice the attitude of the Bible authors, such as Luke "it seemed good to me also, having had perfect understanding of all things from the very first, to write to you an orderly account, most excellent Theophilus, that you may know the certainty of those things in which you were instructed." Luke 1:3,4 Or Peter "we did not follow cunningly devised fables when we made known to you the power and coming of our Lord Jesus Christ, but were eyewitnesses of His majesty."