Zetterberg was 3 points behind Datsyuk at the end of the night the last game Datsyuk played. 12-24-36 in 33 games for Z against 12-27-39 for Dats. Since Dats went down, Z has scored 4-9-13 in 10 games, which projects to 13-30-43 over 33 games.
Z has been making great offensive plays all season, no matter who he's with, no matter the situation. People were saying his scoring would drop without Datsyuk; instead it's increased by 20%. Z is Datsyuk's equal offensively, and better defensively. It's like the Yzerman/Fedorov situation. If the Wings never drafted Fedorov, Yzerman would have kept on scoring 100 points, even with an improved defensive game. Why? Because it would have been necessary for him to drive the offensive engine. In the 90s, the offense was shifted to Fedorov as the primary force. Yzerman was the secondary offensive force, and was used as a skilled matchup center in much the same fashion that Z is used by the Wings when the twins are split, or how Flip has been used this season. It took away from his offensive performance but his top-end skill, experience, and clutch play led to more wins for the team.
Realistically the best two-way player is Lidstrom, but this thread is really about forwards, so he doesn't really apply.
I have to disagree that Z's Datsyuk's equal offensively. He's just a bit below Datsyuk's level. In the playoffs hsi game translates much better, though, and in that area I'd say Z's definitely a superior player. The brand of hockey Zetterberg plays is perfectly suited to the playoffs.
Datsyuk is just a flashier player. His puck skills are so impressive on both ends of the ice it's hard not to be dazzled by him. Zetterberg's always been a lower-key kind of guy and that's part of it.