Very few could compare to Wayne, not Datsyuk, nor Sundin...we need to look at Lemieux, Orr and Howe in order to compare to Wayne. It's definitely easier to focus in on stopping Wayne while he played for a weaker Kings team. Messier was the 2nd line centre with the Oilers playing behind Wayne...imagine that.
It's arguable whether Datsyuk is a better player than Sundin. Here are 10 years worth of their stats in their most productive years for their respective teams. Of note, Sundin played many years in the clutching and grabbing era, where he was consistently mugged and draped over by opposition players. Those Leafs teams also weren't very deep, so the opposition could simply focus on stopping him. Sundin consistently delivered more for a worse team over those years. I would argue Sundin is the better player.
Sundin:
Year: total points, team GF (goals for), percentage contribution to team GF
1995-96: 83 pts, 247 goals, 33.60%
1996-97: 94 pts, 230, 40.87%
1997-98: 74 pts, 194, 38.14%
1998-99: 83 pts, 268, 30.97%
1999-00: 73 pts, 246, 29.67%
2000-01: 74 pts, 232, 31.90%
2001-02: 80 pts, 249, 32.13%
2002-03: 72 pts, 236, 30.51%
2003-04: 75 pts, 242, 30.99%
2005-06: 78 pts, 254, 30.71%
Datsyuk:
Year: total points, team GF (goals for), percentage contribution to team GF
2003-04: 68 pts, 255, 26.67%
2005-06: 87 pts, 301, 28.90%
2006-07: 87 pts, 252, 34.52%
2007-08: 97 pts, 252, 38.49%
2008-09: 97 pts, 289, 33.56%
2009-10: 70 pts, 223, 31.39%
2010-11: 59 pts, 257, 22.96%
2011-12: 67 pts, 239, 28.03%
2012-13: 49 pts, 122, 40.16%
2014-15: 65 pts, 231, 28.14%