Imu is concerned about both Luffy and Blackbeard, tearing both their posters down. Given Luffy is the reincarnation of Joyboy, placing Blackbeard along the same lines as someone to be equally concerned of, along with Shirahoshi, who is an ancient weapon, that gives Blackbeard quite some hype, especially since we don't know much about his past or his relations, only, that he is from the D clan, which in itself is already a hype tool.
Blackbeard basically is the antithesis to Luffy, so I doubt Oda will make one into the successful liberator of the world, while the other one will just be discarded as a failure before the real battle begins.