Vandenbergh and Vanmarcke both did too much work in the early phase...
When the live images started (ca. 120K to go), both of them were dragging the peloton too much in the "(wind)fans", while Terpstra, GT and Roelandts stayed (as much as possible) a bit further down in that first fan.
Vdb - like a good helper - gave his wheel to Cav... then apparently raced back to the second chasing group (catching and apparently dropping Cav... - which isn't very helper-like - since Cav didn't make the merge of the 3 groups at about 90K to go) and then jumped multiple times away to try and set-up an escape... my guess would be because at that moment in the race, it's still ok for him to go into an attack, while later on he would need to pull the group along for Stybar/Terpstra
(He was actually the one to start the Vanmarcke/GT group... only he did this while Stybar was getting back to the back of the peloton after a flat.. again not the smoothest of things)
I've got the feeling he wants to show his form (and would like to win something with his form) but he is struggling a lot between his ambitions and having to follow team orders:
- giving aid/his wheel to team leaders
- needing to pull the peloton already way before the final (i.e. spending unnecessary energy if you want to ride a good final)
- being in an attack, but not being allowed to help/ride in it (as again happened until Terpstra had jumped across)... which isn't great to start a fan-base either
He either needs to accept the fact he is riding for a team where he is 4th fiddle at best (Boonen, Stybar, Terpstra) and put his ambitions/struggles aside (and cash his probable nice fee at EQS)...
or (what I secretly would recommend him) go to a team that needs a (co-)leader for this Flanders work, like e.g. Garmin, Orica, IAM or even Astana or Team Lotto.nl