It's not just their requirements that we need to watch out for, we need to consider our requirements too in such a calculation. We get almost 90% of our oil from our Western flank, and with Chinese bases teeming in the region- Djibouti, Gwadar (possibly being readied) and whatever surprise China is going to pull in the region next, and also their holdouts in Sri Lanka, Myanmar, we need to be cautious of their activities. Their supplies to these bases will have to pass through Malacca (unless CPEC ever gets realized). Formulation of a plan by the IN as such is a necessity, regardless of where the Chinks get their oil, or trade even for that matter ( with the Northern Sea Route over the Artic expected to open up, given the rate of warming there, global trade in and out of China is expected to shift significantly further to the North).