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On the surface it's easy to understand why Williams picked Alex to drive over Logan for the weekend (better track record + more experience = more likely to get points for them) but the thing is NEITHER have gotten points yet and last year's AusGP resulted in EIGHT retirements, so this just puts so much pressure on Alex and probably destroys Logan's confidence in the team and himself.
It also means if Alex doesn't perform then he and the team are going to get a whole lot more criticism than they already have, which I don't honestly think is deserved (at least not on Alex's end). Time will tell if the decision pays off though.