Looking at verses from an ancient scripture in the present, and then claiming that they predict the arrival of a leader hundreds of years after the scripture was written, is not hard to understand and not limited to the reading the puranas and the vedas. Problem is-- the so called "truth" of these predictions is always based in the imagination of people running wild. They are reading ancient scriptures much later than they were written. So it is not really a prediction but is hindsight.
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/gurmat-vichaar/18511-is-it-true-can-it-so.html

The same mental condition promotes this as with the prophecies of Nostradamus.

In my opinion, the tendency to focus on these predictions comes from the fear and the need to be able to say "I have discovered the truth" -- making one feel especially blessed and therefore safe and important.
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/showthread.php?t=18511

If Akaal is our support, then we don't need to be concerned one way or the other.