Truth be told, I'm not sure there are any simple answers here. Very CP6s and 8s have basically the same psychological pattern and can be virtually identical. You'd need to examine the underlying motivation in this case, and that's not always conscious or readily noticeable by others. Sorry to break it to you, it's not as simple as kicking someone's ass, and the "weaker" one is the 6.
As the two types become unhealthy, that's when they begin to diverge--but most of us never really become that unhealthy. Sixes can indeed be pressurable, but generally when they feel that they're alienating themselves from their allies. They recognize strength in numbers. If you have a 6 set against his/her perceived enemies, you may never see that side of them, same as 8s.
About me--I am operating under the assumption that I am a 6w5. I also have 8 in my tritype. I don't want anyone to turn this into yet another thread that winds up insulting 6s as weak little downbackers and glorifies 8s--both strategies coexist inside me, both are strong, and both have their place. I'm not sure there is any simple way to tell one type from another by behavior alone--we all overlap, and when you figure in instincts, levels of health, tritype, and background, you can get a real clusterfuck.
What you say, Swordsman, is absolutely true. I do not seek outside validation; in fact, my entire life has revolved around how little validation I have ever sought--I've always been immune to peer pressure. I could care less what people think of me; I'm out for myself and that's all. I've survived things which, according to a medical professional, should have psychologically destroyed me. Yet I'm still going strong. I challenge the next person who pulls a "cowardly 6" stereotype on me to live for a
day in my life.
Also, an interesting fact to know and tell: I live in Cambodia, right next to
the infamous S-21 genocide museum. Twenty thousand people went in to that jail, and each and every one of them was starved, beaten, tortured, and forced to confess to imaginary crimes against the state, after which point they were hauled out to a field and bludgeoned to death. Thousands of people of every type were broken in half wound up ratting out their own families--there is not one exception; the 12 or so survivors just happened to be alive when the Vietnamese invaded. Differences between 6 and 8? At bottom, there's no difference between any of us.
(The guy who ran the jail and so expertly knew how to intimidate people and break them in half is a 1, btw.)