I think it all depends on how well you know the person. If you don't know them well,I wouldn't say anything in fear of making him/her mad. On the other hand,if you do know them well, they would appreciate the advice and wouldn't be offended.
A few years back when Raptor was fairly new, I had a friend larger than me that was going to CP. I simply told him that he might not be able to ride due to the restraint design. he thanked me and decided to try anyways.
After his trip,he told me he did ride but had 2 ride-ops help him. They did warn him at the entrance.
Either way,I wouldn't lose any sleep over it,Jo
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http://www.magnummania.com jerry@magnummania.com