Gundo is great addition for two reasons.
1) Rodri cover.
When I imagine this midfield, I am not that worried about Rodri being rested or rotated.
Very high quality and decent midfield, capable to play against any team I bet.
---------Gundo------------
Bernie------------Kovacic
2) Julian Alvarez replacement. Can play second striker / false 9 roles. Especially after Oscar Bobb got injured, we needed someone like Gundo.
Here I am talking about Gundo as a squad player.
If Pep somehow returns to his "treble winners" formation, I think we still have the team to beat that RM Galacticos or whatever the fuck they call themselves.
Gundo makes all the sense there is.