I don't think krish is a part of Shiva's plan, he was just laughing at rishita's stupidity that how can she think Shiva will start separate business.
And is the surprise for Raavi? I don't think he'll mortgage his land just for her birthday surprise.
I think the ending scene of the episode pretty much gives it away that he wasn't really thinking of raavi at all during this whole kaand
and at the table, he seemed least bothered about the surprises for her birthday