As MC6800 mentioned the core A5 used for BA don't get anymore assignments. There was quite some heated discussion around that topic in other forums leading to leaving of a number of donors not getting the expected points anymore with the other CPU codes back that days (A3 and A4 cores). But leave that in the past.
These days a new code (A7) is the primary CPU code and I think can go until 27 core/threads without stability issue. You might get assignments for more of that.
Keep in mind that the number of slots need to be a multiple of lower primes (1,2,3). 5 might work; multiple of 7 and higher primes are not working.