This is just my theory, so I'll put it in reflection.
Do we look at only the success rate of someone's track record? Say, if we are to hire them, or partner with them in businesses. Or how important is his failure in history?
If you have talent, all kinds of people would love to come partner with you left and right. Trustworthiness is also a kind of talent. Many of them would assume that you are the one being evaluated while they are above evaluation themselves. They may even find it shocking if you even attempt to evaluate them back.
But then how do you judge them? First, I would think that someone who's failed much in life (and also aware of, admitted his shortcomings) and learned much from it is all that matters. But if he has never achieved as much as he failed, that tells me that he's probably just good for failing.
Then we look back at those who's track records are only successes. Unlike others, my first impression is not Wow, that's impressive! But more cynical instead: Of course he's successful, he's rich, he's living the American dream, he never have to go through trials, never knew what hardship is like. Rarely would I think that he just got it without the experience of failures. Nevertheless, I'm not that closeminded. Only that such virtually flawless character is rare and more likely would not care about being my friend anyway, seeing that I may be his first downfall rather than being brought up by him. So this metric, let's just sleep on it for now.
There's certainly no need to befriend those who have neither: failure nor success. For they are cowards in life. Unlike how others would perceive them, I actually see these as worse than those who always fail in life. Those who fail fail because at least they attempted something. These however, do nothing, Jesus even condemned these as flatterers and what they have already have would even be forfeited. One ought to run away from these and there are plenty of such around us, recognizing them may not be straight forward.
Consequently, there's only one option left for me, if I cannot find the perfect friend, that is to befriend someone who's failure and success are equal and respectively great. And I should also strive for success greatly, boldly, so that the kind of friend I am, is also the kind whose failure and success are great equally as well!