To be honest at the time I presumed Alonso was being smart, braking a little early and more than he perhaps needed to, to harvest some additional battery power to use later in the lap and to help counter any slipstream, DRS benefit, or performance advantage George might have had opportunity to use. Brake early at a point where he couldnt be passed, be able to power out of the corner earlier plus benefit later in the lap with more battery power at his disposal.
Having said that I didnt hear any mention post incident of the fact Alonso had / might have braked early for those harvesting reasons.