IIRC Buendia has been discussed on our Wish Lists since the summer we signed Pepe.
I'd absolutely love to have him here and would play him across the 3 in the 4231, but not as an automatic starting player.
I'd initially look to use him much like LFC have used Jota this season prior to his injury = bring him in off the bench and then use him to rotate the players until he proves he is better than the current options on merit.
EDIT - Whilst Buendia is my #1 choice as far as an AM type goes, if Norwich are genuine about their valuation then I'd look to Brandt as an alternative.