Not always, but usually. And pardon me, but it's not really what you know Ajagba is capable of - it's what you think/believe... Without the evidence, there is no "know", only hunches, gut feelings and speculations.
I see with my own eyes Ajagbas tools and he has good ameture experience, you said the exact same thing about Wardley until he beat Parker, that he was "unproven" and that Parker is "levels above" which is why you favored Parker lol. He's good enough to be a top 10 contender
It's all speculation, at best, until it's proven. The eye test is only as good as the level it's been proven at. Amateur pedigree is often a crapshoot - some storied amateurs make great pros, and some make relative nobodies.