Pino and Kamada, who are ahead of Osario at the moment, have both improved noticeably over time. That is to their credit. I would probably have both Pino and Kamada in my XI, and would certainly like to see a three man midfield of Wharton, Timber, and Kamada.
That said, both Pino and Kamada were so awful for so long, that I think perhaps the improvement in both players has been mistaken for high performance levels.
They have gone from terrible to reasonable in Pino's case, and bad to good in Kamadas. A lot of this has been in Europe against weaker opponents at a slower pace. None of this makes them good enough to be match winners in the league, where they have very low scoring and creating records.
Moreover, they lack pace and physicality, which is often important if seeking to play a bit deeper and more compact, and seeking to counter at speed, as many of us feel the team should.
Overall, there is absolutely no way that Pino and Kamada are undroppable.
I have no idea as of yet whether Osario is good enough. It would be perfectly reasonable for the next manager to overlook him in favour of a proven, known quantity like McNeill, for instance.
What Osario does seem to have is physicality. As others have said, he seems quick. There have been a couple of moments where the pace and power of the league has seemed to surprise him, but he appears to have adjusted to that side of things far quicker than Pino did.
Finally, he actually seems to have a pair of bollocks. With three minutes to go and nothing to play for, very few players would have thrown themselves face-first into that header against Liverpool. It was such a total nonsense of a penalty decision, the latest evidence that modern officials just do not understand football at all, that Osario's physical courage could easily be overlooked. It shouldn't be.
I could imagine Dyche or someone playing a deep 451 with Osario on one wing and Pino on the bench, on the basis that the former has the athleticism to help defensively and also burst forward on the break.
Whether he's actually any good remains to be seen, but he does have that in his favour.