I think Webb & Company are sending out hint what is about to happen next with that pic of Avi sitting under the Sinister 6...and I think I got a hint what may transpire.
When Spidey defeats Electro, Norman realize he need to arm a group of specially train men, to kill Spidey, in turn stopping Spidey from exposing Oscorps unethical experiments, and secret underworld operations. Norman proceed to send a team of five after Spidey, who struggles against them, still defeating them however...because the team does not work well together, and are easily out-smarted. In the meantime, the battle gave Norman the opportunity to discover Spidey's identity.
So Norman take it upon himself, to appoint himself as the Leader & sixth member of TS6! In the mist of the battle is when Norman wits matches Peter's, as Norman bring some strategy and organization to the team, as this time the team is on the verge of defeating/killing Spidey...while Norman hold & reveal his Ace Card against Spidey.......Gwen Stacy! That is what changes the outcome of Spidey's battle with TS6. His rage and desperation to save Gwen is what turns the tables; but, in Norman recognition that Spidey is overcoming the team, and his own desperation to get away, does something mysteriously, before dropping Gwen from the bridge. Peter, in his attempt to save Gwen, in fact saves her dead body, and the mystery begin...was she already dead or did Spidey indirectly kill her.
Hmmm.....