He's not a great LB. He worked well in the Spain game, because of the tactical specifics of that match. His future is in midfield IMO.
He played last season predominantly in central midfield. I think he is a great player personally, Ajax player of the season for the past couple of seasons (including while Eriksen was there) and Dutch player of the year this past campaign so there is no doubting he's good. But, he isn't the answer to our left back situation. He's a bit of a oddity in that he plays DM or LB but he is actually very good on the ball with both feet and can obviously put in a good cross so I think a midfield 3 would suit him best and if we were to be interested we'd have to ship a few first. This is why I don't think the Shaw deal to UTD makes a difference on whether LVG goes for Blind, he could easily accommodate both