I did not get your point. Are you saying that if there is a war with China then we should leave that from and settle the score with Pakistan first?? Or you have an entirely different definition of war.I don't believe we will be at fault in case we attack Pakistan first. Then China will be seen as the aggressor in case China attacks after India's invasion.
Furthermore according to me a two front war scenario would happen after much deliberation by both of our adversaries meaning they would attack us simultaneously hence not giving us time to attack either of them 'first'.