Dadan: Sabo~~~!!! Tell me this isn’t true~~~!!
Doflamingo: Fufufufu!! I can’t get tired of this world!! Things are getting interesting!! Fufufufu
Blackbeard: Hey, you guys, ready the ships!! Rather than letting the Marines have it, I’ll take it myself!!!
Blackbeard doesn't know about Sword, and based on the context of the page the conversation is about Sabo's Mera Mera.
A Yonko infiltrating Mariejois? Who do you think you are? Shanks? We already saw Laffitte sneak into a Warlord meeting. Now Catarina can imitate anybody she wants, Shiryu can touch the entire crew and turn them invisible. The Blackbeard Psyop Corps is incredible. They may not get to Sabo, but they could retrieve some juice treasures from Pangea castle. This plot line sounds insane. Blackbeard could grab the final Road Poneglpyh, a national treasure, or be the first outsider to discover Im-sama's existence.