I agree! Even I was confused when I watched it for the first time but later, I understood that it is not what people assuming it is!
Instead of people questioning him and him not able to reveal the actual reason, it is actually good that he said that reason. Now he can concentrate on the main point here, that it is not Sai's fault!
What I don't understand is Kaku still believes Pakhi even after Virat clarifies everything. Like kuch bhi!