Cloud Never Joins Avalanche?

One interpretation of the beginning footage in the trailer is that it’s showing the events in an alternate timeline. Cloud is missing from the group of Avalanche members’ bodies recovered by Shinra, seemingly after their attempt to break out of the headquarters or potentially during a routine reactor bombing mission. The fact that the spikey-haired hero is missing has some fans wondering if the footage is a brief look at a Final Fantasy VII timeline where he never made it to Midgar, or perhaps one where he joins Sephiroth instead of fighting him at the end of Final Fantasy VII Remake.