There was bloodshed anyway, but probably not on the scale that would have occurred if Partition had not happened

Albaby,
I love your posts, but I think you may be off in this line of thinking.
15 million people were butchered during the Partition. I don't know what scale you're thinking of, but it was unnecessarily bloody 100%.
The British were quickly getting rid of the unprofitable parts of their empire and did not particularly care how they did it. They fought viciously for Kenya and Malaysia because those were profitable, they just wanted to get rid of India, Pakistan, Israel, and Palestine.

And to your other point, almost all successful empires have always been multiethnic. The Roman empire, the Persian empires(#1 and #2), the British empire, you name it. Homogenous groups can form a nation state, but they don't get very big or powerful as a rule.