Lovely post Rekha. Was looking forward to reading this.
I also did some reading online on both horses n elephants.Aastha is shown riding a white horse. It means she will become more intuitive and instinctive of her surroundings than before. Also the horse was very strong n powerful n galloped out of control. It might mean that she needs to curb her free nature n let it not overpower her. She needs to be more careful in expressing her feelings. As far as Shlok is concerned, he is overwhelmed by Aastha's love and his earlier beliefs are going for a toss. So he is trying to rein in his feelings to maintain a semblance of control.Aastha riding a white horse could mean that she is the saviour of the Agnihotri Khandaan aka to Kalki avatar, getting rid of evil n harbinger of good.Shlok has a thing going on with the sun. The sun god's chariot is driven by a white horse with 7 heads. Him chasing Aastha n able to rescue her, could mean acceptance of his feelings n help change the mindset of the family.The white elephant was shown when abhay was there, so agree with your analyis that he has outlived his usefulness n is expensive now. Aditi could be the same. She proved to be very expensive to Niranjan in terms that she almost cost him his favorite baccha's life. As a result she is no longer of any use to him now.Nimmy