Thomas should thank Valgren for pulling back Pietrobon and then him out for the sprint.
Nah, it's Paleni he needs to send a gift basket to. That guy chased for no reason just to get 4th. Like WTH, there is not a different outcome for Paleni in that situation except maaaybe third. Was he doing it just to spite Pietrobon? At least Pietrobon tried to win.
Inasmuch as Valgren chased it was because the race was his to lose.
And for anyone who thinks you have to contribute equally then let the strongest legs win in the end, (a) stop watching cycling, (b) Pietrobon is visibly several inches taller than anyone else in that break, so he was providing better shelter (and receiving less draft) than all the others all day.