CookieCuttah said:Well Cubbage was "Introducing" the rocket launcher to everyone else when you came in, so most probably Gman didn't even tell Cubbage about Gordon or anything, he was just like "Hey I heard you had dropship problems, want to buy a rocket launcher?" .
Except Cubbage was speaking from experience in the briefing he was
giving about how to use the rocket launcher as an effective weapon
against the Gunships.
The conversation was probably more along the lines of
"I've heard Gordon Freeman is coming this way, if he makes it this
far he could probably use a rocket launcher; but don't mention my
name if it comes up".
Once you get there, Cubbage seems fairly keen on the idea of having
you use it.