I don't think KSG 'might' have quit the show because of the story part. Because, connecting the time EK has released the news of Parth's webseries to the media, with the hype EK & SP is giving to Bajaj, there are all chances that the story is going to go in PreRish way. In that case, the news of KSG quitting due to Bajaj being treated as a supporting character cannot be believed. KSG quitting most probably would be because his contract ended and he didn't want to extend his contract as he might not be comfortable to shoot in these conditions. And I respect him for the matter that he sticked to his decision, though I still see a 10% chance of EK surprising KZKians with KSG continuing as Bajaj. 😆 She resorting to all these type of negative/positive PR gimmicks & that too only for KZK among her 5 shows that are on air, even after what all has happened recently with and around her, is enough to understand to what extent she will go to get her ego win w.r.to her favorite characters. All these hyping of KSG leaving can be just EK's cunning way to misguide online fans of AnuPre. That is the reason why I am looking forward for KZK, to see how EK is going to take the story forward as it is not an easy task to win the detached TRP audience back. This is not my words. It's the words of one of her own senior CV Chloe's words, who in one of her LCs sometime back had told that getting back audience to watch TV shows is difficult now and so they are planning to start both the Bhagya shows as new one, instead of continuing the old tracks.
Now coming to Sharad Kelkar, though I preferred him over GC, I don't see him agreeing to play Bajaj. https://youtu.be/0Sz34PDL8Ug. This is his IV done almost one month back. And going by his own words, he has already webseries & films lined up through out the year, starting from August. So, unless EK has decided to concentrate on AnuPre in the future track, I don't think he will be chosen as Bajaj. KP ka tho I am doubtful because of his baby.
Again, incase KSG has really quit, then high chances can be GC will be Mr. Bajaj, as he might be having a contract with SP when they got him on board Sanjivni which is still valid, just like how Shruthi Sharma who was casted in Nazar2 is now taken into Gul's Jin show, as Nazar2 is shelved. My guess can be wrong too.
Coming to SBS putting up other names not given in SP's list, i lost trust on them long back when they made Eri unfollowing Shaheer on IG their hot news, after 1year of it happening. They later had to apologize for it when both Eri and Shaheer raised their voice against such irresponsible reporting. Moreover, reading through a lot during these days after Sushant's demise, I have realized how media just for having more hits and increased viewership, can completely be inhumane and can come up with false reporting evenif it can destroy anyone's career and life. It is high time that we the readers/audience teach both the media and the producers a lesson to not play with actor's and fan's emotions.