I think that A1 End cels are Key cels too, but 
don't quote me on that because I'm not 
positive. I say this because A1 end cels 
always are important because the sequence 
is just that ONE shot that's well focused in on, 
so naturally you'd want the most experienced 
animator to draw them... 

*another example below* XD *loves her a1 
ends*