Isaac,
The Dennis Martinez is fine and is a nice example.
I mostly was concerned with the Rogers because I don't recall him signing like that. Since you got it in person, you should have no concern.
Bunning looks a little different that I've seen him sign, but it's unlikely that anyone would fake him since his sigs are readily available.
I don't have any experience with Felix Hernandez, so I can't comment on him.
Koufax is a commonly forged autograph, but I don't feel 100% confident commenting on yours, one way or another. You may want to have others give you their 2 cents.
Thanks for sharing your collection with us!
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