Michael Schumacher's comeback has not been a success, but the weird thing is he seems to be enjoying it. Are there still questions that he is confident he can answer in a race-winning way?

The puzzling thing about the enigma that is Michael Schumacher's comeback is that, at the half-way point of the season, there is no pattern.

We know that Mercedes is a little lost on the anomalies of the car, and that its specific weakness of front-end grip on a light fuel load is preventing Michael driving the way he naturally prefers to. But even index-linking his performances to team-mate Nico Rosberg, there is no trend. At a couple of races he was marginally faster, at most he's been a little slower. But you'll look in vain for a trend.

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