I thought it was obvious Toro Rosso was a Honda test-bed for the 'mother' team Red Bull. They keep track of the progress Honda makes vs their own Renault unit and make a decision. Seems they like what they see. Toro Rosso is nowhere close to the level Red Bull is so it just seems like they know how much better they'd be with the same engine is not a loss compared to what they have now and what they see in store.
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