I'd say the editors might be to blame for failing to properly raise new talents. We've had quite a bit of new talents run these past 2 years and almost all of them hardly made much of an impression, personally anyway. Jujutsu might be the one that stood out but even then the story needs work. From the 6in round to now, overwhelmingly, only the veterans are able to stick around but even then not sell particularly well by Jump standards. Go back even further and few newbies have made it with the biggest ones being Kimetsu and Neverland. I really think Jump has to rethink how its going to grow rookie mangaka who haven't had a series or maybe one series.