Yes, Messi should win, but VVD is more than "one of the Liverpool star players". Together with GK Allison Becker he has turned around the previously weak Liverpool defense. He has been voted best Premier League player, and deservedly so. He definitely is Liverpool's best player. If Liverpool wins the CL final, he should be a candidate for Ballon d'Or, probably the only threat to Messi for this award.
By losing three or four times in UCL this season? Certainly, liverpool defense is the best in this current season.
I don't think it's right that by having accomplished a wall all season in EPL (only one lost the entire season), then you would draw a straight line for all competition. Two weeks ago it could be 4-0 and not 3-0. He's not better than Pique, at least in UCL. And Allison not better than MATS.
Messi is different. Domestic, he's like twice the 2nd best player, not only in goalscoring but in other things. UCL, top scorer and created many chances. In europe, another golden boot. Like i have said, just one goal or one quick eye during origi's second could turn everything upside down.