[Disclaimer: I'm not a metallurgist, physicist, or doctor, but...] I doubt any more flex in the material of the mask Marsh was wearing would have helped him that much more. There are clearly differences between titanium and the other grades of metal in masks, but for one single mask shot, I think it's probably negligible.
It's like saying a plastic cup is better than a steel cup because it can probably flex more on impact. You are still getting hit very hard in the balls, and it's going to hurt like hell either way.
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