[stale2002]

You have this wrong.

As soon as the chain diverges, they are seperate chains.

Yes, if you have a minority of the hashpower, you can hardfork yourself off the main chain, and continue to follow your smaller chain, regardless.

But you don't get a longer chain than the main one. So you'd continuously be behind, and would not get the work of the main chain, and likely most exchanges would not accept your smaller fork coin, and you would end up like bitcoin cash.