I don't think Own or Rooney are near where R9 was at Barcelona, as a striker, when he was 20, for that year before his injuries (Spanish football was on TV then). He had the pace of Owen but could also do so much more, with much more control and skill. That's be best I've ever regularly seen anyone play the game for a season, including Messi even. That's not to put Messi down mind of course, or Cristiano Ronaldo, they were both in a different class altogether and for so long.
A lot of the pro's say R9 he was even better the next year at Inter, when he got 25 goals in Seria A in 32 games the next season. We didn't get to see that in the UK as it wasn't on TV. The defences then in Italy were insane, and the sides were so negative. Obviously the 1998 world cup was that year too, and he was ludicrous there as well.
Even the 2002 world cup, after his first injury he was still on a different level to Owen and Rooney.
R9 definitely on a different level to Owen, but Messi had seasons that eclipsed R9's best, both in terms of raw output and what we seen each player do on the pitch.