As far as 5 and 6 go in the powerlifting circles, I think it is being focuses on a lot more lately. To me, working on my flexibilitys actually helped my lifts as I was able to get into better postion, and use my leverage better as I wasn't struggling to get get into positions.
With conditioning, it is more of living healthier in general, obviously everyone isn't going to care about this. But, I feel that putting your body in a better state through some GPP can't do anything but help your lifts.
Class I Total @ 198: 525/335/600 (1460)
"No citizen has the right to be an amateur in the matter of physical training.... What a disgrace it is for a man to grow old without ever seeing the beauty and strength of which his body is capable."