Assembler theology question

[Phil Smith III]

We've all seen (and written!) code like this:
         USING PSA,R9                  
         L     R10,PSATOLD             Get current TCB
         DROP  R9
 
         USING TCB,R10                 
         L     R9,TCBJSCB              Get JSCB
         DROP  R10
 
I've also seen (and probably written) the equivalent:
         L     R10,PSATOLD-PSA(,R9)    Get current TCB
         L     R9,TCBJSCB-TCB(,R1)     Get JSCB
 
I like the latter because it's tighter to read, reduces the USING map, keeps 
you out of trouble if you decide to use R9 or R10 for something global, etc. 
But I can also see a theological argument that you really *are* using (USING?) 
the control block.

Thoughts? (Yes, I *said* it was theology, so I'm prepared for religious 
arguments!)