The phrase "rather than otherwise" is correct and commonly used in written English.
It is typically used to indicate that something is more likely to happen or be true in a particular way, rather than in a different way. An example of its usage could be: "I believe that you will succeed in your new job, rather than otherwise." This means that the speaker thinks the listener is more likely to succeed than fail in their new job.
The fact that he's so often quoted is a sign of his talent rather than otherwise.
But it then adds that the F.D.A. must ban rather than otherwise regulate a drug or device that cannot be used safely for any therapeutic purpose.
It's a reading encouraged, rather than otherwise, by the disclaimer at the beginning of the first book: "This is not an autobiographical novel: it is about some other portly, dissolute, immoral and middle-aged art dealer".
Obviously not, for it leads to breakdown rather than otherwise.
First, to give us the criteria by which we distinguish something that we would label 'designed' rather than otherwise.
The index also shows a tendency of sea currents to have positive dispersal effects leading to smaller risks rather than otherwise.
If only money truly were unavailable, rather than otherwise-allocated.
See Sidgwick (1874, 484) ("… there may be rules of social behaviour of which the general observance is necessary to the well-being of the community, while yet a certain amount of non-observance is rather advantageous than otherwise").
Unknown to Troubridge, however, he added a postscript saying "I am not really anxious to do The Well of Loneliness and am rather relieved than otherwise by any lack of enthusiasm I may encounter in official circles".
The proclamation for his capture, issued following the plot's failure, described him as "a man of mean stature, and rather low than otherwise; square made, somewhat stooping; near 40 years of age; his hair and beard brown; his beard not much, and his hair short".
I think I'm afraid it's too difficult to say I'd like someone else to win rather than me, otherwise I wouldn't be here.
