Okay, I agree with your explanation and I can accept that. I agree with you that you're more likely to crash in the rain and I agree that crashes on the track can be hard on a bike....
but I still have two points that I want to address... Please note that I'm not trying to correct you on anything that you've said, it's just that your post brings up a couple of thoughts that I want to share/clear up.
1 - It's a track bike and it's probably been down regardless of what tires are on it, thus he should probably have the frame measured either way and I think we can both agree on that. Unfortunately, what you originally said was he should check the frame BECAUSE you saw rain tires on it. Thus, even though that's not what you meant, to me, you IMPLIED that you think there's a difference between wet a crash & a dry crash. But ya know what? There is a difference between wet a crash & a dry crash... In general a crash in the rain is usually EASIER on the bike than one in the dry because, overall, the speeds are reduced.
So I'll admit that your thought process may not have been backwards, but the way you communicated definitely made it seem TO ME that it was.
2 - I know you didn't make a comparison between street & track crashes, but I still want to bring up the point that yes, although race/track crashes can be hard on a bike, track crashes aren't necessarily any harder on the bike than street crashes... Sure, it's more LIKELY to have been crashed because it's a track bike, but I've seen far more bikes end up completely unrecognizable after a street crash than after a track crash.