Because in that way you can have both Link and ToonLink which you can replace with PSA, and still have Geno in Brawl.
Anyway, here is the beta of Geno ported over Lucas:
http://www.mediafire.com/?ya5slov15ofd2bx
(If you downloaded this before, please redownload (Neutral-B has been partially fixed)).
It's a beta because of this:
-Only some graphics are ported (FSmash, Neutral-B, Up-B, Down-B).
-FAir has no movement momentum (it glitched up with it).
-His Down-B on the ground didn't work, so I temporarily replaced it with a standard attack (10% damage and decent enough knockback to make it non spamable).
-The graphics of the Neutral-B won't work properly (will either go all out of not).
-Up-B goes into Special fall after it's finished (therefor I added a hitbox with 8% damage and decent knockback).
-Side-B is still PK-Fire (couldn't figure out how ToonLink's Side-B worked).
-Final Smash is still PK-Starstorm (no glitches whatsoever for both Side-B and Final Smash).
It's doesn't freeze in whatever way possible.
(Credit for Stickman for porting ToonLink's model over Lucas).