I'm going to start taking the statements about the back pain with a pinch of salt tbh and will clear my mind about that after the Worlds.
Yes, he is probably with some troubles with his back, which probably made him readjust his program. But, even for VDP, I don't expect to see someone who presumably couldn't do more than 2 hours of training at a moderate pace come to a race, two months after the last in the middle of the season, and do the kind of ride he did. And the field wasn't stellar but we aren't talking about slouch riders either.
The conspiracy theorist in me can't stop thinking that this, in terms of pressure and perception, is perfect for him. He would be hands down one of the big favourites for the Worlds and all the eyes would be set on him. And with his strengths in a sprint, we would have a target on his back and no one would work with him in equal terms if they found them in a group with him as we've seen several times. Now, the focus is in Van Aert and Colbrelli and almost no one talks about him. Perfect for his race. And all the talk about the participation in the Worlds still not being certain? I have many doubts about that after his win. It could be true before the race but right now? Have a hard time believing it...
The team said today that he felt his back yesterday but nothing that wouldn't be expected on the day after a race (even more with an aggresive surface like the one featured in Antwerp Port Epic).
This is probably all rubbish, but I'm going to wait for the 26th. Probably that extra 1% will be missed but if things come down to be decided in a burst of power on one of the final climbs or if he arrives there and smokes everyone, I wouldn't be surprised with any of the outcomes.