Practice, like testing, doesn't really count for much, riders will tell you. When you talk to the afterwards, they will tell you that they didn't set a really fast lap because they were working on set up, or trying to figure out which tire will be best in the race, or working on race pace rather than one lap pace. Maybe they were saving tires, or maybe they ran into traffic, or maybe there wasn't enough time left in the session to go for a fast lap. Even the rider who is fastest will tell you they were surprised, they were not really pushing for a time, but it just came naturally.
All valid explanations, but not necessarily true, of course. After all, free practice is just free practice, and as long as you are inside the top ten, with a good chance of advancing straight to Q2, then there is no reason not to dip into your Bumper Book of Excuses to fob off journalists with. They are unlikely to challenge you on such excuses, because as long as your explanations are plausible, they have no way of countering them. It is impossible to know the mind of Man.