Good ol' silhouette piece. I'm not too hyped about this, but rather what it leads up to, because it's still a flashback based on Sabo's story, so Oda cannot just cut it away with a lazy ass cliffhanger like Imu saying "Lilly..". There has to be a follow up with that Imu situation. Afterall Sabo saw Imu on the empty throne and we are probably going to see, who murdered Cobra. So there's that.
And when Akainu and Black horse talked in 1054, we were informed that the god's knights were intervening in the St. charlos matter, which means we might see them aswell.
Gotta give it to Oda tho: This flashback ties very well into the Eggheard plot with Saturn and/or the Kuma going back to MJ- plot. Mighr even see a God Knight stopping Kuma.
Some lore and some reveals are definitely going to come out of this in the following chapters