You shouldn't have to remove #6 to simply change pads...
Maybe I'm wrong, but I could swear that I had the pads out during tire change. If that's possible it's typically possible to push the pistons in by hand or using a lever of some sort. I'll have to check this - I need to check my pads shortly anyway...Huh? How are you going to push the piston back in, even if you could get the pads off without removing the caliper?