If Keita can become a dependable "recycling merchant" who stays fit and available for most of the season, I would frankly be delighted with that because it would be a lot more than what he gave us in the past 3 seasons. But I also think we have to look at what was needed from our midfield against Burnley – Elliott was playing well, but he needed someone to cover for him defensively because you couldn't rely on a 18-year-old making his debut to be faultless in that aspect. Plus Burnley were a lot more active and creating more chances than Norwich – so it makes perfect sense that Keita was more cautious in that game compared to the first game.
I think this is why Klopp seemed happy with Keita's performance after he took him off after 75 minutes – it was a necessary sacrifice for the team. To be honest, we lost a bit of solidity when Thiago came on in Keita's place and it's a good thing the game was won at that point.