Do these autographs look authentic? (All Current Players)

These were purchased about five or so years ago (when I first got in to autographs and didn't really know anything). Looking back on them, I'm not so sure about their authenticity, so I thought I'd turn them over to the board and see what everyone here thinks, so here they are...
Tim Lincecum

Zach Greinke

Ichiro Suzuki

Justin Morneau

Vladimir Guerrero

Donte Stallworth

Kyle Orton

Thanks,
Roger
Tim Lincecum

Zach Greinke

Ichiro Suzuki

Justin Morneau

Vladimir Guerrero

Donte Stallworth

Kyle Orton

Thanks,
Roger
0
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The Vladimir Guerrero is the worst autograph attempt I've ever seen, in history. It's not even an attempt at his signature, looks like it was just a guess!
<< <i>Vladimir, Morneau, Ichiro all NO IMO. >>
Plus these are all waist down shots, who wants that?
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