I didn't come up with the CANZUK idea, that's just what the movement is called. It shows that there isn't a great desire for Indian membership. You've failed to address the point about Indian political values, which are divergent from the four CANZUK states, and the point about the difficulties of integrating CANZUK with the much weaker Indian economy. India simply wouldn't work as a member state. For me, the best way to go about this would be to create a completely free-trading, free-movement CANZUK union, and then form comprehensive trade deals with Anglophone African nations, the US, and India, before moving onto trade deals with other countries and blocs like the EU, Mercosur, Switzerland, Singapore, etc.