Yes, I believe India and Japan expect invites into China's big tent, and Beijing would happily offer them, because their rival scheme can't effectively compete with the better organized and supported BRI. One of the biggest problems India and Japan will face, beyond BRI being much further ahead, is the 'China standard' participating countries have accepted for their infrastructure projects. Also, India and Japan don't have a cohesive policy to offer, therefore have little choice but to join the BRI, if business efficiency is the top consideration.
China will happily accept Japan and India into OBOR, because it requires them to acknowledge Chinese leadership and influence in this project.
And yes, India and Japan can't compete in terms of organisation, financial resources or industrial capacity. So they can either join OBOR or be left out.
Looking at the ET article, it's kind of deluded
On Chabahar port.
The US quietly dissuades China from seriously investing in Iran. How are India or Japan going to be any different?
On Indian and Japanese infrastructure
Given that India can't get its own infrastructure sorted out, how do other countries expect India to contribute in terms of finance or expertise? And Japan's infrastructure is excessively high cost given the price at which Chinese companies can do the same job.
On Dawei
The Tanintharyi Region has less than 2million people and has no hinterland. So what sort of infrastructure or port is viable???
In comparison, Kyaukpyu port in Myanmar is the terminus for roads, railways and pipelines from China. And these communications lines pass right through the middle of the Myanmar.
Ditto for Gwadar port in Pakistan.