bitcoin cash is a fraction of bitcoin, then it is unlikely to be a real bitcoin.
you are getting two things wrong. there is no real, original, blah blah... bitcoin. there is only "bitcoin". and bitcoin is what the overwhelming majority decides is bitcoin. if having no SegWit and having 8 MB blocks could gain this majority it would have been bitcoin and since it couldn't do that, it is an altcoin.
secondly price doesn't matter in this argument. of course it is obvious that bitcoin will always have a higher price than all of its forked altcoins but that is not set in stone. for example there are altcoins (42 coin for example) that are worth a lot more than bitcoin but that doesn't make them any good.