The argument about Matt Dillon always was whether he outdrew the other guy in the opening credits.
In all the versions of the opening credits that I can recall, Matt was always outdrawn, but he was still standing and the other guy presumably wasn't. If I remember correctly, that was the whole theme of the pilot episode (the one with the introduction by John Wayne), which would seem to make some sense. I guess that just as in real life, "fast is fine but accuracy is final." Of course, in the rest of the series he usually either drew faster (with deadly accuracy) or got ambushed and shot in the back.