Was reading an article on O'Donnovan and his background today which was very interesting.
If you look at his career before th HAL he has only ever scored goals in Ireland and Brunei (Singaporean League at the time). Other than that his stats are dire for years.
Point being the league the player comes from and their level of success is a good indicator, but it still comes down to the individual qualities of the player. And by my reckoning tall target type strikers have never worked in the HAL. Strikers need athleticism to press in this league.
That being said Kokko was never utilised in a way that would give him any chance to be successful. He can clearly find the net in the right circumstances yet Jones decided to isolate him upfront and expect miracles.