I'd bet he has a much better idea of what their actual weights are than any of us would so I doubt he's exaggerating at all.
234 is Silva's walk around weight, when he is OUT OF SHAPE. Rampage walks around at 250, but that doesn't mean he is some freakin' huge heavyweight.
I'm sure Silva stated sometime back that he starts cutting down from 205 pounds for his fights at 185. Furthermore, he weighed in at 202 pounds for the fight against Bonnar. I'm sure GSP is just trying to exaggerate the weight difference between him and Silva just to convince the fans that he is getting the short end of the stick if he takes the fight against Silva.
Also, GSP's trainers said he fought against Shields at 192-194 pounds.
Not that I want to see the Silva-GSP fight anymore though. I just found it funny that GSP is trying to make it look like there is such a HUGE weight difference between them two. If he doesn't want the fight, just say it. No need to come up with so many ridiculous remarks and excuses.