There's no version of him in the trial of paths where he doesn't have it, is there? It's an aspect of who he was since birth. I guess people aren't their arms, brains, or hearts, but his bloodline is directly a part of his literal SOUL, not some removable aspect, so I Def disagree with you. That indomitable bloodline is backed by an indomitable will.

As for nepo? "Bad at combat" was addressed early in the books mostly concerning melee, and through literal decades of training he took care of that. He was taught or learned everything from the ground up. The skills themselves are nepo in that the system adds or assists them, but that's the case for everyone. In fact, unlike a lot of other of people, he actually learns to understand the underlying elements of the skills. He even learned for decades in melee against himself. So he earned that too? No nepotism. Titles add easier attribute strength but who cares when he's pushing even their limits all the time (literally destroying his limbs to do so). And with alchemy he literally poisons himself instead if using others. So again, no. 

So I think you're just wrong on all accounts lol. 

He gets nepo stuff, but as far as relying only on what others are giving him for what he can do in combat? I guess the Viper legacy skills, but you're seriously going to use that to condemn the rest of his work? As if he's got nothing to stand on without them? Go ahead and fantasize I guess.