Asahi doesn’t realize it, does he? He may have some skill and talent that can use everyone’s knives, but in the end it’s just stolen stuff. He doesn’t have the experience of the frustrations the chefs go through to get those skills because he’s so overly fixated on the final result of their journeys.
On the other hand, Yukihira has no need for a hundred knives. All his experiences and knowledge from battling a variety of opponents, him “stealing” their skills are all embedded into that one single knife that he holds. And that one knife is way more valuable than a thousand different ones.
Asahi doesn’t realize it, does he? He may have some skill and talent that can use everyone’s knives, but in the end it’s just stolen stuff. He doesn’t have the experience of the frustrations the chefs go through to get those skills because he’s so overly fixated on the final result of their journeys.
On the other hand, Yukihira has no need for a hundred knives. All his experiences and knowledge from battling a variety of opponents, him “stealing” their skills are all embedded into that one single knife that he holds. And that one knife is way more valuable than a thousand different ones.