Koeman became Barca manager....
How about you actually give him a chance to make a claim. He did attract PL interest initially from his work at Molde after all, there were other clubs after him, not only Cardiff.
Poch was Spurs manager for 5 years and won nothing, and bottled multiple chances, if Spurs stuck with him, he potentially could have put a nail into his reputation, as it stands the mythology around him remains.
If Ole can repeat the same as last year, close the gap and win a trophy, he will move up in the reputation stakes.
That said Ole's also showed his bottling of chances, missing out on top 4 in his first (half season) year and not at least converting 3 semi finals into a final.
I think you are overrating Poch, I don't rate either that highly, if we get Poch, it would be more of a side step than anything.