Don't always take orchestration books at face value when discussion of the "unusual" instruments. The older ones (Berlioz, Rimsky-Korsakoff and others) barely mention the saxophone, much less the bass or sopranino.
Many of the "newer" ones (even from the golden age of the instrument) don't address it, probably because the horn was so thin on the ground. My one book on 1930's dance band arranging is consistent in that regard.
And, the most recent one that I reviewed (in the book store - I didn't buy it for a variety of reasons, the extreme cost among them) was so far off base on bass clarinet and sax that it was laughable. The author made the categoric statement that the bass clarinet in A had never existed - this at a time when you could buy one from Selmer if you had the tin. Since I once owned one (a Buffet Albert system horn in A) as well, that was two strikes on the veracity of that author.
(I don't recall his comments on the bass sax, or even if he had any at all.)
I would imagine that most who have written books on orchestration have seldom touched any musical instrument save the piano or violin. What information they have on "other horns" is all (by its very nature) going to be of the second hand variety at the very best. I would imagine that (in practice) it's normally much worse.
Thin on the ground horns (as in basset horn or Ab/D/C/basset clarinets or the extreme saxophones, the bass trumpet, the contra-bass trombone, or any realistic discussion of what makes up the family commonly referred to as "the tubas") is always (by its very nature once again) going to be second or third hand.
So, selling the bass saxophone (classic or otherwise) is going to be treated in a superficial fashion in even the best of orchestration books. To expect anything else is nothing more than wishful thinking.
(After three weeks of extreme key signatures in three different shows (Guys & Dolls, The Pajama Game (with, as is so often the case, the classic "The New Musical" tacked on the end of the title) and Bye, Bye Birdie!, I'm not too fond of arrangers right now...)