Both Sensei (Senseis? That looks weird, what's the correct plural here?) are aware of my time splitting and both are fine with it...
What are the pros and cons of rank within A and B for you?
Ashley, I agree. Sensei, or sensei's? What is the plural? Totally confusing to me.
As to pros and cons, I'm happy to promote under either affiliation. Both organizations are still headed by 2 of O Sensei's uchdeshi. I don't honestly have strong attachments to who my grading comes from because both organizations' dan certificates are recognized by Hombu Dojo, and both of the sensei I would be training under I feel provide excellent instruction and quality.