is krai actually weak or not?

AFAIK, he's genuine and legitimate level 8. He wasn't carried by his friends and he didn't buy his status. Arnold's description is the most fitting - his talents simply lie somewhere else than combat ability.

The most common theory is that he's master at using relics. Do you remember when he got that fire sword from newbie hunter and managed to unleash its power in mere seconds with zero training? So speculation is that he can recognize, "feel" relics and use them to their full potential.
Personally I think author is being sneaky by showing us Krai's perspective and he's fooling his audience into believing that it's actually true, while public perception of Krai is wrong. But what if it's the other way around and Krai is simply an idiot who can't recognize his own talents?
My guess is that he actually has some passive precognition ability because everything works in his favour in the end. He simply, unknowingly takes actions that lead him to favourable outcome.
Also, I could understand general public would get fooled and somehow convince themselves that Krai is strong. But his party? They are all geniuses and prodigies - they didn't make Krai their leader for no reason, not matter what MC believes himself.

His weakness is his biggest strength; nobody can replicate his feats because of his weakness as they would all die the moment they tried to imitate his life with their strength. I will not tell you the reason as it is a major spoiler.

@delta123456789 pls tell me
Put a huge spoiler sign with Capital letters in the beginning and you're good.
I really want to know.
Also is it stated in the manga?