I don't expect him to start for quite a while. Hopefully he'll make an impact when he gets the chance. His tackling and energy should be useful. I have some concerns his tendency to always press could occassionaly leave gaps in behind to be exploited. Hopefully that doesn't happen too much.
He's not what I would have wanted on the ball but it was pretty clear from the players we were linked with that the team didn't want a progressive passer. Personally I thought we should have been looking for someone to help control the midfield, so waiting to be convinced that this is the way forward. I do worry a bit about Ugarte's position in the team if we get a new manager who wants a more possession-based approach.
The ideal is probably that our style of play under ETH does work, he stays long-term, we have success and Ugarte becomes the long-term successor to Casemiro in the team, preferably being able to cover more ground without us losing too much of Casemiro's creativity, aerial ability and goal threat.