I am firmly anti-drafting a WR in the top 5 for any team, much less the Chiefs for numerous reasons we've discussed before. With all the other needs, I don't believe Pioli would draft a 1st round WR, but for the sake of discussion on a boring day, let's discuss why if we were to draft a WR in the 1st round, it would be Jeremy Maclin, not Michael Crabtree.
1. We already have a Fitzgerald-like receiver
Larry Fitzgerald is a big bodied, tall, tough receiver. He's not a burner, he ran a 4.5+ 40 yd dash, but has the ability to get open and make plays.
Though there is no 40 yd dash time available for Crabtree because of his foot injury, scouts expected it to be between 4.45 and 4.5. At his Pro Day, Bowe ran once at 4.40 and the second time at 4.49.
Larry Fitzgerald is 6'3, 220 lbs
Dwayne Bowe is 6'2, 221 lbs
Michael Crabtree is 6'1, 214 lbs
2. Maclin would be a complementary #2 to Bowe
Bowe is a very good receiver over the intermediate routes and his size makes him tough over the middle. But he doesn't have speed to make him a threat for the long ball. Maclin and his 4.3 40 yd dash would demand the attention of defenders and force them to defend the long ball. If Crabtree were brought on board, you would have two very good options in the intermediate route, but it would allow the safeties to cheat up knowing it was unlikely the CBs were going to get beat deep.
3. Maclin would give the Chiefs a quality return man
With Pioli's renewed emphasis on Special Teams, having a legitimate return threat on punts and kickoffs would add yet another dimension to the Chiefs that has been sorely missed since a couple years before Dante Hall left. Starting each offensive series on the 40 yd line rather than the 20 would make a huge difference in the field position battle aiding our offense and helping our defense.
As I said in the beginning, I don't think and I don't desire the Chiefs to draft a wide receiver in the 1st round. But for the sake of discussion, when you think about what Pioli said he wanted, which was to "build a team, not to just collect players", you have to look at these two guys, Maclin and Crabtree in the context of not which one scored more TDs in college, but which one is more complementary to "building a team" and not just picking the guy the scouts say is a little better.
Crabtree will likely become a very good WR in the NFL. But so will Maclin. In my eyes, there is no question which would help the TEAM more.