I think he did KA simply because that's the best one he got at that time and not because he wanted to as he didn't had much to do in it. He shared a dure edit with YouTube link to the new episode. Let's see if this one lasts or another unfollow kand is waiting for us
He did KA bcz of Ahmed sahab's writing..he signed up knowing that its a multi track drama..he said this to Rabia in IV. May be he did not know that in later parts Shehreyar's role will be given more preference.
Bilal has stated in quite a few IVs that the script, story matters to him the most and he should be able to connect with it...if he is not then even if script/story is good he would say no to it...So KA's writing is the main thing which made him do it.
Also at that point he had TMK also in his hand... and I guess IM was also decided by then...
So in total he had 3 projects in his hands..but unfortunately things did not work out the way he wanted...
363