As a person who BECAME a Gretzky fan because of the 1993 playoffs (still shocked when I see that was Lidstrom on ice for the GWG against) and eliminating TO to get to the Finals, I can tell you that:
No way in HELL was Gretzky anywhere near Yzerman in defense - ever.
No way does Gretzky do what Stevie Y does in 97 and especially 98
And we STILL had Yzerman do some great things in the 2002 playoffs.
Now if we got Gretzky for Gallant and some OTHER picks, we have something, but Yzerman? No effing way.