Please refer me to the fights where Silva was smashed up badly on the ground. Surely you're not referring to the Lutter or Henderson fights. Silva contained all but 2 of Lutter's strikes when he was mounted briefly, and still took little to no damage. Henderson had zero leverage to land anything substantial, and no, those peppering hammer fists don't count. I'll grant you that Silva's takedown defense is a little suspect, but his Jiu Jitsu has been proven time and time again. I do think GSP could possibly control Silva on the ground, but it would be a lay and pray win. Silva is sure to land something, and that's all that it would take to rock GSP's glass chin.